Cabletron Systems Network Card 8021Q User Manual

802.1Q VLAN  
User’s Guide  
9032599-02  
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NOTICE  
Cabletron Systems reserves the right to make changes in specifications and other information  
contained in this document without prior notice. The reader should in all cases consult Cabletron  
Systems to determine whether any such changes have been made.  
The hardware, firmware, or software described in this manual is subject to change without notice.  
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,  
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT  
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR  
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN  
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH  
DAMAGES.  
1999 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005  
All Rights Reserved  
Printed in the United States of America  
Order Number: 9032599-02 February 1999  
Cabletron Systems and SECUREFAST are registered trademarks and SMARTSWITCH is a trademark  
of Cabletron Systems, Inc.  
All other product names mentioned in this manual may be trademarks or registered trademarks of  
their respective companies.  
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Tables..................................................................................................... viii  
PREFACE  
CHAPTER 1  
1.2 Types of VLANs........................................................................... 1-3  
CHAPTER 2  
2.3.1 Defining a VLAN ............................................................. 2-2  
2.4 VLAN Switch Operation............................................................... 2-3  
2.4.1 Receiving Frames from VLAN Ports............................... 2-4  
2.4.2 Forwarding Decisions ..................................................... 2-5  
2.4.2.1 Broadcasts, Multicasts, and Unknown  
Unicasts.......................................................... 2-5  
2.4.2.2 Known Unicasts.............................................. 2-5  
2.5 GARP Switch Operation.............................................................. 2-6  
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Contents  
CHAPTER 3  
3.7.1 Viewing Current VLAN Ports.........................................3-22  
3.8.1 Displaying the Current Protocol, VLAN ID, and  
Port Assignments ..........................................................3-28  
3.8.2 Assigning a Protocol Family to a VLAN ID....................3-28  
3.8.3 Displaying the Protocol Types on Current Ports ...........3-30  
3.9 Protocol Ports Configuration Screen..........................................3-31  
3.9.1 Adding/Deleting Ports Associated with a VLAN ID........3-33  
3.10 Quick VLAN Walkthrough ..........................................................3-33  
iv  
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CHAPTER 4  
4.2.1 Solving the Problem........................................................ 4-5  
4.2.2 Frame Handling .............................................................. 4-8  
4.3 Example 3, 1D Trunk Connection to 802.1Q VLAN Network .... 4-10  
4.3.1 Solving the Problem...................................................... 4-12  
4.3.2 Frame Handling ............................................................ 4-13  
4.4 Example 4, Isolating Network Traffic According to Protocol...... 4-17  
4.4.1 Solving the Problem...................................................... 4-18  
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Figure  
1-1  
2-1  
3-1  
3-2  
3-3  
3-4  
3-5  
3-6  
3-7  
3-8  
3-9  
3-10  
3-11  
3-12  
3-13  
3-14  
3-15  
4-1  
4-2  
4-3  
4-4  
4-5  
4-6  
4-7  
4-8  
4-9  
Transmitting to Switch 4........................................................... 4-9  
Transmitting to Bridge 4 ......................................................... 4-10  
Example 3, 1D Trunk Connection to 802.1Q VLAN Network. 4-11  
Bridge 1 Broadcasts Frames.................................................. 4-14  
Switch 2 Forwards to 1Q Trunk.............................................. 4-15  
Switch 1 Forwards to 1D Trunk.............................................. 4-15  
Example 4, Isolating Traffic According to Protocol................. 4-18  
4-10  
4-11  
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Table  
3-1  
3-2  
3-3  
3-4  
3-5  
3-6  
3-7  
802.1Q VLAN Configuration Menu Screen Menu Items .......... 3-7  
Device VLAN Configuration Screen Field Definitions ............. 3-9  
Port Assignment Configuration Screen Field Definitions........ 3-15  
Port Filtering Configuration Screen Field Definitions ............. 3-19  
VLAN Forwarding Configuration Screen Field Definitions ..... 3-22  
Protocol VLAN Configuration Screen Field Definitions ......... 3-26  
Protocol Ports Configuration Screen Field Definitions .......... 3-32  
802.1Q VLAN User’s Guide  
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PREFACE  
Welcome to the Cabletron Systems 802.1Q VLAN User’s Guide. This  
guide introduces and describes Cabletron Systems’ implementation of the  
IEEE 802.1Q standard for 802.1Q Virtual Local Area Network (VLAN)  
Cabletron Systems products used in 802.1Q VLAN environments.  
USING THIS GUIDE  
This guide serves as a supplement to the Local Management chapter of  
VLANs. Read Chapter 1 and Chapter 2 first to gain an understanding of  
VLANs, the associated terminology, and the process for configuring  
VLANs on a switch. Look at the examples in Chapter 4 to see how  
VLANs can be created and changed using the existing network  
infrastructure in a building and how the switch handles the frames while  
they make their way through the networks shown in the examples.  
Chapter 3 describes the VLAN Local Management screens and provides a  
quick walkthrough on how to use them to configure VLANs in a switch.  
STRUCTURE OF THIS GUIDE  
This guide is organized as follows:  
Chapter 1, Virtual Local Area Networks, presents the basic concepts of  
information about how to obtain additional help if needed.  
Chapter 2, VLAN Operation, describes the operation of an 802.1Q  
VLAN operation, and examines the operation of an 802.1Q VLAN  
switch.  
Chapter 3, VLAN Configuration, describes how to set up the switch for  
local and remote management, shows the Local Management screens  
used in 802.1Q VLAN configuration and explains their use.  
Chapter 4, Examples, offers examples of 802.1Q VLANs and explains  
how network transmissions are treated by the components of each VLAN.  
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Preface  
RELATED DOCUMENTS  
Other Cabletron Systems documents that may be useful for understanding  
some of the concepts introduced or discussed in this guide are listed  
below:  
The SmartSwitch user’s guide of any Cabletron Systems 802.1Q VLAN  
aware SmartSwitch device.  
The manual can be obtained from the World Wide Web in Adobe Acrobat  
Portable Document Format (PDF) at the following site:  
DOCUMENT CONVENTIONS  
The following conventions are used throughout this document:  
Note symbol. Calls the reader’s attention to any item of  
information that may be of special importance.  
NOTE  
In Local Management sections, Bold type indicates fields, field values,  
and commands that can be highlighted or selected by the user.  
In Local Management sections, keystrokes are shown in UPPERCASE.  
Italic type denotes complete book titles.  
x
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CHAPTER 1  
VIRTUAL LOCAL AREA NETWORKS  
This chapter introduces the concepts of Virtual Local Area Networks  
(VLANs) and discusses the central concepts of IEEE 802.1Q VLANs.  
This chapter also contains information on how to contact Cabletron  
Systems for additional support related to VLANs.  
1.1  
DEFINING VLANs  
A Virtual Local Area Network is a group of devices that function as a  
single Local Area Network segment (broadcast domain). The devices that  
make up a particular VLAN may be widely separated, both by geography  
and location in the network.  
The creation of VLANs allows users located in separate areas or  
connected to separate ports to belong to a single VLAN group. Users that  
are assigned to such a group will send and receive broadcast and multicast  
traffic as though they were all connected to a common network. VLAN  
aware switches isolate broadcast, multicast, and unknown traffic received  
from VLAN groups, so that traffic from stations in a VLAN are confined  
to that VLAN.  
connection is not changed. Stations connected to switched ports do not  
sacrifice the performance of the dedicated switched link to participate in  
the VLAN. As a VLAN is not a physical location, but a membership, the  
network switches determine VLAN membership by associating a VLAN  
with a particular port or frame type.  
Figure 1-1 shows a simple example of a port based VLAN. Two buildings  
house the Sales and Finance departments of a single company, and each  
building has its own internal network. The stations in each building  
connect to a SmartSwitch in the basement. The two SmartSwitches are  
connected to one another with a high speed link.  
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Chapter 1: Virtual Local Area Networks  
Building One  
Building Two  
S
S
S
S
S
S
F
F
F
F
10  
9
8
7
trunk  
1
6
A
B
SmartSwitch  
SmartSwitch  
F
S
Member of Sales Network  
Member of Finance Network  
2263-01  
Figure 1-1 Example of a VLAN  
In this example, the Sales and Finance workstations have been placed on  
two separate VLANs. In a plain Ethernet environment, the entire network  
is a broadcast domain, and the SmartSwitches follow the IEEE 802.1D  
bridging specification to send data between stations. A broadcast or  
multicast transmission from a Sales workstation in Building One would  
propagate to all the switch ports on SmartSwitch A, cross the high speed  
link to SmartSwitch B, and then propagated out all switch ports on  
SmartSwitch B. The SmartSwitches treat each port as being equivalent to  
any other port, and have no understanding of the departmental  
memberships of each workstation.  
In a VLAN environment, each SmartSwitch understands that certain  
individual ports or frames are members of separate workgroups. In this  
environment, a broadcast or multicast data transmission from one of the  
Sales stations in Building One would reach SmartSwitch A, be sent to the  
ports connected to other local members of the Sales VLAN, cross the high  
speed link to SmartSwitch B, and then be sent to any other ports and  
workstations on SmartSwitch B that are members of the Sales VLAN.  
1-2  
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Types of VLANs  
1.2  
TYPES OF VLANs  
There are a number of different strategies for creating Virtual Local Area  
Networks, each with their own approaches to defining a station’s  
membership in a particular VLAN.  
1.2.1  
802.1Q VLANs  
An 802.1Q VLAN switch determines the VLAN membership of a data  
frame by its Tag Header, described later in this chapter. If the frame  
received is not tagged, the switch classifies the frame into the VLAN that  
is assigned as the default VLAN of the switch.  
Some or all ports on the switch may be configured to operate as GARP  
VLAN Registration Protocol (GVRP) ports. If a frame received is tagged,  
the frame is forwarded to the GVRP ports that are configured to transmit  
frames associated with the frame VLAN ID and protocol. If the received  
frame is not tagged, the frame is examined and tagged as belonging to the  
default VLAN. Then the frame is forwarded to the GVRP ports that are  
configured to transmit frames associated with the default VLAN and the  
frame protocol.  
1.2.2  
SecureFast VLANs  
Cabletron Systems’ SecureFast VLAN strategy takes a different approach  
to creating virtual LANs. In a SecureFast VLAN environment, the  
switches in the network recognize Network Layer routing requests and  
translate them. Based on this translation, the switches set up a connection  
between the end devices in the network.  
1.2.3  
Other VLAN Strategies  
VLANs may also be created by a variety of addressing schemes,  
including the recognition of groups of MAC addresses or types of traffic.  
One of the best-known VLAN-like schemes is the use of IP Subnets to  
divide networks into smaller subnetworks.  
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Chapter 1: Virtual Local Area Networks  
1.3  
BENEFITS AND RESTRICTIONS  
The primary benefit of the 802.1Q VLAN technology is that it provides  
localization of traffic. This function also offers improvements in security  
and performance to stations assigned to a VLAN.  
While the localization of traffic to VLANs can improve security and  
performance, it imposes some restrictions on network devices that  
participate in the VLAN. Through the use of Filtering Database ID’s  
(FIDs) security can be implemented to enable or prevent users from one  
or more VLANs from communicating with each other.  
One or more VLANs can be assigned to a FID so that all the users that  
share a common FID can communicate with each other regardless of their  
VLAN affiliation. However, for the sake of security, the members of one  
FID cannot communicate with the members of another FID.  
To set up a VLAN, all the network switch devices that are assigned to the  
VLAN must support the IEEE 802.1Q specification for VLANs. Before  
you attempt to implement a VLAN strategy, ensure that the switches  
under consideration support the IEEE 802.1Q specification.  
1.4  
VLAN TERMS  
To fully understand the operation and configuration of port based VLANs,  
it is essential to understand the definitions of several key terms.  
VLAN ID  
A unique number (between 1 and 4094) that identifies a particular VLAN.  
VLAN Name  
A 32-character alphanumeric name associated with a VLAN ID. The  
VLAN Name is intended to make user-defined VLANs easier to identify  
and remember.  
Filtering Database Identifier (FID)  
Addressing information that the device learns about a VLAN is stored in  
the filtering database assigned to that VLAN. Several VLANs can be  
assigned to the same FID to allow those VLANs to share addressing  
information. This enables the devices in the different VLANs to  
communicate with each other when the individual ports have been  
configured to allow communication to occur.  
1-4  
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VLAN Terms  
The configuration is accomplished using the Local Management VLAN  
Forwarding Configuration screen. By default a VLAN is assigned to the  
FID that matches its VLAN ID.  
Tag Header (VLAN Tag)  
Four bytes of data inserted in a frame that identifies the VLAN/frame  
classification. The Tag Header is inserted into the frame directly after the  
Source MAC address field. Twelve bits of the Tag Header represent the  
VLAN ID. The remaining bits are other control information.  
Tagged Frame  
A data frame that contains a Tag Header. A VLAN aware device can add  
the Tag Header to any frame it transmits.  
Untagged Frame  
A data frame that does not have a Tag Header.  
Default VLAN  
The VLAN to which all ports are assigned upon initialization. The  
Default VLAN has a VLAN ID of 1 and cannot be deleted or renamed.  
Forwarding List  
A list of the ports on a particular device that are eligible to transmit  
frames for a selected VLAN.  
Port VLAN List  
A per port list of all eligible VLANs whose frames can be forwarded out  
one specific port and the frame format (tagged or untagged) of  
transmissions for that port. The Port VLAN List specifies what VLANs  
are associated with a single port for frame transmission purposes.  
Filtering Database  
A database structure within the switch that keeps track of the associations  
between MAC addresses, VLANs, and interface (port) numbers. The  
Filtering Database is referred to when a switch makes a forwarding  
decision on a frame.  
1Q Trunk  
A connection between 802.1Q switches that passes only traffic with a  
VLAN Tag Header inserted in the frame. By default, a port designated as  
a 1Q Trunk port has all VLANs in its Port VLAN List and is configured to  
transmit all frames as tagged frames. A 1Q Trunk drops all incoming  
frames that do not have a VLAN tag.  
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Chapter 1: Virtual Local Area Networks  
1D Trunk  
A connection from a switch that passes only untagged traffic. By default,  
a port designated as a 1D Trunk port has all VLANs on its Port VLAN  
List and is configured to transmit all frames as untagged frames.  
Generic Attribute Registration Protocol (GARP)  
GARP is a protocol used to propagate state information throughout a  
switched network.  
GARP VLAN Registration Protocol (GVRP)  
A GARP application used to dynamically create VLANs across a  
switched network.  
GARP Multicast Registration Protocol (GMRP)  
A GARP application that functions in a similar fashion as GVRP, except  
that GMRP registers multicast addresses on ports to control the flooding  
of multicast frames.  
1-6  
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Getting Help  
1.5  
GETTING HELP  
For additional support related to this device or document, contact  
Cabletron Systems using one of the following methods:  
World Wide Web  
Phone  
(603) 332-9400  
Internet mail  
FTP  
anonymous  
Login  
Password  
your email address  
To send comments or suggestions concerning this document, contact the  
Cabletron Systems Technical Writing Department via the following  
email address: [email protected]  
Make sure to include the document Part Number in the email message.  
Before calling Cabletron Systems, have the following information  
ready:  
Your Cabletron Systems service contract number  
A description of the failure  
A description of any action(s) already taken to resolve the problem  
(e.g., changing mode switches, rebooting the unit, etc.)  
The serial and revision numbers of all involved Cabletron Systems  
products in the network  
A description of your network environment (layout, cable type, etc.)  
Network load and frame size at the time of trouble (if known)  
The device history (i.e., have you returned the device before, is this a  
recurring problem, etc.)  
Any previous Return Material Authorization (RMA) numbers  
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Chapter 1: Virtual Local Area Networks  
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CHAPTER 2  
VLAN OPERATION  
This chapter describes the operation of a VLAN switch and discusses the  
operations that a VLAN switch performs in response to both normal and  
VLAN-originated network traffic.  
2.1  
DESCRIPTION  
The 802.1Q VLAN operation is slightly different than the operation of  
traditional switched networking systems. These differences are due to the  
importance of keeping track of each frame and its VLAN association as it  
passes from switch to switch or from port to port within a switch.  
2.2  
VLAN COMPONENTS  
Before describing the operation of an 802.1Q VLAN, it is important to  
understand the basic elements that are combined to make up an 802.1Q  
VLAN.  
Stations  
A station is any end unit that belongs to a network. In the vast majority of  
cases, stations are the computers through which the users access the  
network.  
Switches  
In order to configure a group of stations into a VLAN, the stations must  
be connected to VLAN aware switches. It is the job of the switch to  
classify received frames into VLAN memberships and transmit frames,  
according to VLAN membership, with or without a VLAN Tag Header.  
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Chapter 2: VLAN Operation  
2.3  
CONFIGURATION PROCESS  
aware SmartSwitches default to operate in the 802.1Q VLAN mode.  
However, further configuration is necessary to establish multiple logical  
networks.  
The actual steps involved in VLAN configuration using Local  
Management are presented in Chapter 3, VLAN  
NOTE  
Configuration.This brief section describes the actions that  
must be taken in very general terms, and is intended only to aid  
in the Administrator’s understanding of VLAN switch operation.  
2.3.1  
Defining a VLAN  
A VLAN must exist and have a unique identity before any ports or rules  
can be assigned to it. The Administrator defines a VLAN by assigning it a  
unique identification number (the VLAN ID), a filter database  
association, and an optional name. The VLAN ID is the number that will  
identify data frames originating from, and intended for, the ports that will  
belong to this new VLAN.  
2.3.2  
Classifying Frames to a VLAN  
Now that a VLAN has been created, rules are defined to classify all  
frames in a VLAN. This is accomplished through management by  
associating a VLAN ID with each port on the switch. Optionally, frames  
can be classified according to a protocol identifier contained within the  
frame. The order of frame classification priority is by VLAN Tag, a  
protocol match, and lastly the PVID. This combination of the switch  
port’s identification and the VLAN ID becomes the Port VLAN ID  
(PVID).  
At the same time, the Administrator configures the trunk ports that need to  
consider themselves members of every VLAN. The configuration of trunk  
ports is very important in multiswitch VLAN configurations where a  
frame’s VLAN membership needs to be maintained across several  
switches.  
2-2  
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VLAN Switch Operation  
2.3.3  
Customizing the VLAN Forwarding List  
Each port on a VLAN aware switch has a VLAN forwarding list that  
contains, as a minimum, the PVID of the VLAN configured. Additionally,  
the Port VLAN Forwarding List of each port can be configured to allow  
any number of VLANs to be added to its list. In the case of GMRP  
(dynamic VLANs), the list can have VLANs added and deleted by the  
switch as directed by the protocol.  
2.4  
VLAN SWITCH OPERATION  
IEEE 802.1Q VLAN switches act on the classification of frames into  
VLANs. Sometimes, VLAN classification is based on tags in the headers  
of data frames. These VLAN tags are added to data frames by the switch  
as the frames are transmitted out certain ports, and are later used to make  
forwarding decisions by the switch and other VLAN aware switches. In  
the absence of a VLAN tag header, the classification of a frame into a  
particular VLAN depends upon the configuration of the switch port that  
received the frame.  
The operation of an 802.1Q VLAN switch is best understood from a point  
of view of the switch itself. To illustrate this concept, the examples that  
follow view the switch operations from inside the switch.  
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Chapter 2: VLAN Operation  
Figure 2-1 depicts the inside of a switch with six ports, numbered one  
through six. The switch has been configured to associate VLAN A and B  
with FID 2, VLAN C and D with FID 3, and VLAN E with FID 4. Port 6  
has been classified as a 1Q Trunk Port. This classification establishes that  
all VLANs are members of the Port VLAN List for Port 6 and the frames  
transmitted for all VLANs will contain a tag header. Also the PVID for  
Port 6 is set to the default VLAN with its corresponding relationship to  
FID 1. Although untagged frames are not usually present on a 1Q Trunk  
Port, any untagged frames received would need to be classified if the port  
has not been configured to drop all untagged frames.  
Port 1  
Port 4  
Port 2  
Port 5  
Port 3  
Port 6  
A
B
C
FID 2  
FID 2  
FID 3  
Default  
FID 1  
D
FID 3  
E
FID 4  
2599-02  
Figure 2-1 Inside the Switch  
2.4.1  
Receiving Frames from VLAN Ports  
When a switch is placed in 802.1Q Operational Mode, every frame  
received by the switch must belong, or be assigned, to a VLAN.  
Untagged Frames  
The switch receives a frame from Port 1 and examines the frame. The  
switch notices that this frame does not currently have a VLAN tag. The  
switch recognizes that Port 1 is a member of VLAN A and classifies the  
frame as such. In this fashion, all untagged frames entering a VLAN  
switch assume membership in a VLAN.  
A VLAN ID is always assigned to a port. By default, it is the  
Default VLAN (VLAN ID = 1).  
NOTE  
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VLAN Switch Operation  
The switch will now make a forwarding decision on the frame, as  
described in Section 2.4.2, Forwarding Decisions.  
Tagged Frames  
In this example, the switch receives a tagged frame from Port 4. The  
This frame may have already been through a VLAN aware switch, or  
originated from a station capable of specifying a VLAN membership. If a  
switch receives a frame containing a tag, the switch will classify the frame  
in regard to its tag rather than the PVID for its port.  
The switch will now make a forwarding decision on the frame, as  
described in Section 2.4.2, Forwarding Decisions.  
2.4.2  
Forwarding Decisions  
The type of frame under consideration and the filter setting of a VLAN  
switch determines how it forwards VLAN frames.  
2.4.2.1 Broadcasts, Multicasts, and Unknown  
Unicasts  
If a frame with a broadcast, multicast, or other unknown address is  
received by an 802.1Q VLAN aware switch, the switch checks the VLAN  
classification of the frame. The switch then forwards the frame out all  
ports that are identified in the Forwarding List for that VLAN. For  
example, if Port 3, shown in Figure 2-1, received the frame, the frame  
would then be sent to all ports that had VLAN C in their Port VLAN List.  
2.4.2.2 Known Unicasts  
When a VLAN switch receives a frame with a known MAC address as its  
destination address, the action taken by the switch to determine how the  
frame is transmitted depends on the VLAN, the VLAN associated FID,  
and if the port identified to send the frame is enabled to do so.  
When a frame is received it is classified into a VLAN. The destination  
address is looked up in the FID associated with the VLAN. If a match is  
found, it is forwarded out the port identified in the lookup if, and only if,  
that port is allowed to transmit frames for that VLAN. If a match is not  
found, then the frame is flooded out all ports that are allowed to transmit  
frames belonging to that VLAN.  
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Chapter 2: VLAN Operation  
For example, assume that a frame is received by the switch depicted in  
Figure 2-1. This frame is a unicast untagged frame received on Port 3.  
The frame is then classified for VLAN C. The switch then makes its  
forwarding decision by comparing the destination MAC address to its  
filtering database. In this case, the MAC address is looked up in the  
filtering database FID 3, which is associated with VLAN C and VLAN D.  
The switch recognizes the destination MAC address of the frame as being  
located out Port 4.  
Having made the forwarding decision, the switch now examines the Port  
VLAN List of Port 4 to determine if it may transmit a frame belonging to  
VLAN C. If so, the frame is transmitted out Port 4. If Port 4 has not been  
configured to transmit frames belonging to VLAN C, the frame is  
discarded.  
2.5  
GARP SWITCH OPERATION  
Some or all ports on the switch may be activated to operate under the  
Generic Attribute Registration Protocol (GARP) applications, GVRP  
and/or GMRP. For a description of the protocols and how the frames are  
handled, refer to the user’s guide of your SmartSwitch device.  
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CHAPTER 3  
VLAN CONFIGURATION  
This chapter describes how to set up the switch for local or remote  
management, and the VLAN Local Management screens used to create  
and configure VLANs in a SmartSwitch.  
3.1  
MANAGING THE SWITCH  
The switch may be managed locally via a terminal connected to the COM  
port, or remotely (SNMP or Telnet sessions) from a management station  
connected to a switch port that is a member of the same VLAN as the  
switch’s Host Data Port. (By default, this is the default VLAN.) When the  
switch is configured with VLANs, special precautions must be taken to  
use remote management.  
3.1.1  
Switch Without VLANs  
When the switch is powered up, the switch uses its default settings to  
switch frames like an 802.1D switch. In this default configuration, all  
ports are a member of the default VLAN (VLAN 1) including the virtual  
Host Data Port of the switch, so any port can be used to manage the  
device as shown in Figure 3-1.  
802.1Q Switch  
1
2
3
4
5
6
Host  
Data  
Port  
NOTE: All ports, including the virtual Host Data Port, are  
members of the default VLAN. Therefore, any station  
shown may be used as the management station.  
2599_14  
Figure 3-1 Switch Management with Only Default VLAN  
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Chapter 3: VLAN Configuration  
3.1.2  
Switch with VLANs  
If the switch is to be configured for multiple VLANs, it may be desirable  
to configure a management-only VLAN. This allows a management  
station connected to the management VLAN to manage all ports on the  
switch and make management secure by preventing management via  
ports assigned to other VLANs.  
The switch’s virtual Host Data Port, like any other port, has  
configurable VLAN membership. For manageability of the  
NOTE  
device to be maintained, this port must be a member of the  
same VLAN as the port to which the management station is  
connected.  
Figure 3-2 shows an example of a switch configured with port 1 on the  
Management VLAN port and the other users belonging to VLANs A, B,  
and C.  
802.1Q Switch  
Management  
VLAN  
VLAN B  
VLAN B  
1
2
3
4
5
6
Host  
Data  
Port  
VLAN A  
VLAN A  
7
Set as an 802.1Q Trunk port.  
25992_15  
Figure 3-2 Switch Management with VLANs  
To set up the switch shown in Figure 3-2 to establish a management  
VLAN on port 1, use the process described below:  
1. Use the Device VLAN Configuration screen for the following:  
a. Define a new VLAN named “Management VLAN” (or other  
suitable name) and itsVLAN ID. In this example, theVLAN ID is  
set to 2.  
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Managing the Switch  
b. Set the FID so the Management VLAN has its own number to  
make the VLAN secure. In this example, the FID is 3 and no other  
VLAN should be assigned to this FID. This keeps the new VLAN  
from sharing its filtering database with other VLANs in the  
switch. For details on defining a VLAN, refer to Section 3.4.1.  
2. Use the Port Assignment Configuration screen for the following:  
a. Assign the VLAN ID, 2, of the new Management VLAN to a port.  
In this example, it is port 1. Leave the Port Mode setting in the  
default value of HYBRID.  
It is not necessary to configure a physical port for management  
on each switch. Only those switches that will have a  
NOTE  
management station attached to it need a physical port  
assigned to the Management VLAN.  
b. Assign the VLAN ID, 2, of the new Management VLAN to the  
Host Data Port. The port number will depend on the device. This  
port is not a physical port and will usually be one number above  
the maximum number physical ports on the device, including the  
ports on any optional interfaces installed. In this example, it will  
be port 8. Leave the Port Mode setting in the default value of  
HYBRID. For details on assigning a VLAN ID, refer to  
Section 3.4.2.  
This process would be repeated on every switch that is connected in the  
network to ensure that each switch has a secure Management VLAN for  
switch management.  
If the switch was connected to another switch via port 7, which was set as  
a 1Q Trunk port, then the management station connected to the  
Management VLAN port of either switch could manage both switches.  
The management stations at each switch must be on the same  
Management VLAN.  
NOTE  
No matter how many switches are connected, a management station  
connected to any port on the same Management VLAN can be used to  
remotely manage any Cabletron Systems 802.1Q switch in the network as  
long as the Host Data Port of all the switches are members of the same  
Management VLAN.  
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Chapter 3: VLAN Configuration  
3.2  
SUMMARY OF VLAN LOCAL MANAGEMENT  
The VLAN configuration process is an extension of normal Local  
Management operations. A series of Local Management screens provides  
VLANs and to assign ports to those VLANs.  
A switch supporting 802.1Q VLANs provides the VLAN Configuration  
screens as a standard part of its Local Management hierarchy when the  
switch is configured to operate in 802.1Q Mode. The hierarchy of the  
Local Management screens pertaining to 802.1Q VLAN configuration is  
shown in Figure 3-3.  
Device VLAN Configuration  
802.1Q VLAN  
Configuration Menu  
Port Assignment Configuration  
Port Filtering Configuration  
VLAN Forwarding Configuration  
Protocol VLAN Configuration  
Protocol Ports Configuration  
25994_03  
Figure 3-3 802.1Q VLAN Screen Hierarchy  
3.2.1  
Preparing for VLAN Configuration  
A little forethought and planning is essential to a good VLAN  
implementation. Before attempting to configure a single switch for VLAN  
operation, consider the following:  
How many VLANs will be required  
What stations will belong to them  
What ports are connected to those stations  
What ports will be configured as GARP-aware ports  
It may also be helpful to sketch out a diagram of your VLAN strategy.  
The examples provided in Chapter 4 may be useful for a depiction of the  
planning process.  
Access Local Management as described in your device user’s guide.  
Perform all required initial setup operations. Navigate to the 802.1Q  
VLAN Configuration Menu screen to begin the VLAN configuration  
process for the device.  
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802.1Q VLAN Configuration Menu Screen  
3.3  
802.1Q VLAN CONFIGURATION MENU SCREEN  
When to Use  
To select screens to assign switched network ports to VLANs, define new  
VLANs, and configure port filtering according to a VLAN list or  
untagged frames. Network users can be logically grouped into VLANs  
even if they span long physical distances over a vast, intricate physical  
network. The VLAN Local Management menu items listed on the 802.1Q  
VLAN Configuration Menu allow such VLANs to be configured on a  
network at the switched port of the device or SmartSwitch chassis. Also,  
some or all of the ports on the switch can be configured as GVRP ports,  
which enable frames received with a particular VLAN ID and protocol to  
be transmitted on a limited number of ports. This keeps the traffic  
associated with a particular VLAN and protocol to be isolated from the  
other parts of the network.  
Before attempting the VLAN configuration, ensure that the device to be  
configured has been set for 802.1Q SWITCHING mode. The mode  
selection is a Local Management operation that is accessible through the  
General Configuration screen of the device.  
The device resets when changing operational modes.  
!
CAUTION  
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Chapter 3: VLAN Configuration  
How to Access  
Use the arrow keys to highlight the 802.1Q VLAN CONFIGURATION  
MENU item from the module, device, or chassis specific Configuration  
Menu screen and press ENTER. The 802.1Q VLAN Configuration Menu  
screen displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
802.1Q VLAN Configuration Menu  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
DEVICE VLAN CONFIGURATION  
PORT ASSIGNMENT CONFIGURATION  
PORT FILTERING CONFIGURATION  
VLAN FORWARDING CONFIGURATION  
PROTOCOL VLAN CONFIGURATION  
RETURN  
EXIT  
25994-04  
Figure 3-4 802.1Q VLAN Configuration Menu Screen  
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802.1Q VLAN Configuration Menu Screen  
Menu Definitions  
Table 3-1 802.1Q VLAN Configuration Menu Screen Menu Items  
Menu Item  
DEVICE VLAN  
Screen Function  
Used to view, add, name, enable, or disable VLANs  
CONFIGURATION within the device, and also associate the VLANs to a  
Filter Database ID (FID). It also enables the user to  
configure attributes that apply to the entire switch and/or  
VLANs. Refer to Section 3.4 for additional information.  
PORT  
ASSIGNMENT  
Displays a list of ports and enables the user to assign a  
CONFIGURATION the user to change the operational mode of a port. Refer  
to Section 3.5 for additional information.  
PORT FILTERING  
Used to set the switch to filter out inbound frames to  
CONFIGURATION prevent them from being forwarded by the switch out a  
particular port. This screen also lists the VLANs whose  
frames are eligible to be transmitted out that port. Refer  
to Section 3.6 for additional information.  
VLAN  
FORWARDING  
Used to view which ports are included in the VLAN’s  
CONFIGURATION frame being transmitted. Refer to Section 3.7 for  
additional information.  
PROTOCOL  
VLAN  
Used to assign VLAN IDs to protocol types of received  
frames and to access the Protocol Port Configuration  
CONFIGURATION screen to add or delete transmitting ports associated with  
a specific VLAN ID and protocol type. Refer to  
Section 3.6 for additional information.  
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Chapter 3: VLAN Configuration  
3.4  
DEVICE VLAN CONFIGURATION SCREEN  
When to Use  
To define the operating characteristics of the switch to add, name, delete,  
enable, and disable VLANs, and assign VLANs to FIDs. The screen can  
display up to eight VLANs simultaneously.  
How to Access  
Use the arrow keys to highlight the DEVICE VLAN  
CONFIGURATION menu item on the 802.1Q VLAN Configuration  
Menu screen and press ENTER. The Device VLAN Configuration screen  
displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
Device VLAN Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Forward Default VLAN Out All Ports: [NO]  
VLAN ID  
1
FID  
1
VLAN Name  
Admin Status  
DEFAULT VLAN  
[Enabled]  
VLAN ID: 1  
FID: 1  
VLAN Name: DEFAULT VLAN  
[ADD]  
RETURN  
SAVE  
EXIT  
25993-05  
Figure 3-5 Device VLAN Configuration Screen  
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Device VLAN Configuration Screen  
Field Definitions  
Table 3-2 Device VLAN Configuration Screen Field Definitions  
Use this field …  
To …  
Forward Default  
VLAN Out All  
Ports  
Assign or remove the default VLAN from the Port VLAN  
List for all ports. When set to YES, the default VLAN is  
added to the Port VLAN List of all ports that do not already  
include it. When set to NO, the default VLAN is removed  
from the Port VLAN List of any port that does not have the  
default VLAN as its PVID. The default is NO.  
(Toggle)  
VLAN ID - upper  
part of screen  
(Read-Only)  
Display the assigned VLAN IDs that are configured in the  
module. Initially, only the Default VLAN (VLAN ID: 1) is  
listed.  
FID - upper part  
of screen  
(Read-Only)  
Display the names assigned to the corresponding VLAN  
IDs. If a name has not been assigned to a VLAN, the  
VLAN Name field displays, “Not Defined”.  
Admin Status  
(Toggle)  
Set the current state of the associated VLAN. This field  
toggles between Enabled and Disabled. An enabled VLAN  
is operational and a disabled VLAN is not operational. If a  
VLAN is disabled, all ports assigned to that VLAN will  
assume a PVID of the default VLAN.  
VLAN ID - lower  
part of screen  
(Modifiable)  
Enter input to select or define a new VLAN ID.  
FID - lower part  
of screen  
(Modifiable)  
Display the FID currently associated with the VLAN typed  
in the VLAN ID field. A new number can be typed into the  
FID field to reassign the VLAN to a different filtering  
database. Each VLAN will default to a FID that matches its  
VLAN ID and can be changed to a FID from 1 to 1094.  
VLAN Name -  
lower part of  
screen  
Assign or change names of VLANs. The VLAN Name  
(with up to 32 characters) is an optional attribute of a  
VLAN, and is not required for VLAN operation.  
(Modifiable)  
ADD/DEL  
(Toggle)  
Toggle the action taken between adding the entered VLAN  
to the switch or deleting the selected VLAN from the  
switch.  
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Chapter 3: VLAN Configuration  
3.4.1  
Defining a VLAN  
To define a VLAN, proceed as follows:  
1. Use the arrow keys to highlight the VLAN ID field.  
2. Enter the VLAN ID using a unique number between 2 and 4094. The  
VLAN IDs of 0, 1, and 4095 may not be used for user-defined VLANs.  
If an illegal number is entered, the Event Message Line will display:  
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field  
will refresh with the previous value.  
Each VLAN ID must be unique. If a duplicate VLAN ID is  
entered, the switch assumes that the Administrator intends to  
NOTE  
modify the existing VLAN.  
3. If the VLAN is to be assigned to a different filtering database, use the  
arrow keys to highlight the FID field. If the VLAN is not going to be  
assigned to a different FID, go to step 5.  
4. Type in the ID number of the FID.  
5. Use the arrow keys to highlight the VLAN Name field.  
6. Type a name of up to 32 ASCII characters in the VLAN Name field.  
This is an optional attribute of a VLAN, and is not required for VLAN  
operation.  
7. Use the arrow keys to highlight the ADD/DEL field.  
8. Press the SPACE bar to select ADD for a defined VLAN. Press  
ENTER. The new VLAN will be added to the VLAN list. The message  
“VLAN ADDED” displays in the Event Message Line in the upper  
left-hand corner of the screen.  
The VLAN will not be saved to the switch until the configuration is  
saved.  
9. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The message “SAVED OK” displays.  
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Device VLAN Configuration Screen  
3.4.2  
Changing the VLAN to FID Association  
To change the association of a VLAN to a FID, proceed as follows:  
1. Use the arrow keys to highlight the VLAN ID field.  
2. Enter the VLAN ID of the VLAN of which the FID association is to  
be changed.  
If an illegal number is entered, the Event Message Line will display:  
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field  
will refresh with the previous value.  
3. Use the arrow keys to highlight the FID field.  
4. Type in the ID number of the FID. If the ID number is valid, the Event  
Message Line in the upper left hand corner of the screen displays  
“VLAN # UPDATED”, where # represents the entered ID number.  
5. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The message “SAVED OK” displays.  
3.4.3  
Renaming a VLAN  
To change the name of an existing VLAN, proceed as follows:  
1. Enter the VLAN ID. The VLAN Name field will automatically update  
to display the VLAN’s current name.  
2. Use the arrow keys to highlight the VLAN Name field.  
3. Type a name of up to 32 ASCII characters in the VLAN Name field.  
Press ENTER. If the name is valid, the Event Message Line in the  
upper left hand corner of the screen displays “VLAN # UPDATED”,  
where # represents the entered VLAN name.  
4. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The message “SAVED OK” displays.  
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Chapter 3: VLAN Configuration  
3.4.4  
Deleting a VLAN  
To delete a VLAN from the current VLAN list, proceed as follows:  
1. Enter the VLAN ID. The VLAN Name field will automatically update  
to display the VLAN’s name if that VLAN has been previously  
configured.  
2. Use the arrow keys to highlight the ADD/DEL field.  
3. Press the SPACE bar to select DEL. Press ENTER. The VLAN is  
removed from the list. The message “VLAN DELETED” displays in  
the Event Message Line in the upper left-hand corner of the screen.  
4. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The message “SAVED OK” displays.  
The default VLAN cannot be deleted from the list.  
NOTE  
3.4.5  
Enabling VLANs  
To enable a VLAN, proceed as follows:  
1. Use the arrow keys to highlight the Admin Status field of the selected  
VLAN.  
2. Press the SPACE bar to toggle the field to display Enabled.  
3. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
4. Press ENTER. The message “SAVED OK” displays.  
3.4.6  
Disabling VLANs  
To disable a VLAN, proceed as follows:  
1. Use the arrow keys to highlight the Admin Status field of the selected  
VLAN.  
2. Press the SPACE bar to toggle the field to display Disabled.  
3. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
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Device VLAN Configuration Screen  
4. Press ENTER. The message “SAVED OK” displays.  
The default VLAN cannot be disabled.  
NOTE  
3.4.7  
Changing the Forwarding Mode  
To change the forwarding mode of the switch, proceed as follows:  
1. Use the arrow keys to highlight the Forward Default VLAN Out All  
Ports field.  
2. Press the SPACE bar or BACKSPACE to toggle between YES and  
NO. The YES selection places the default VLAN (VLAN ID=1) in the  
Port VLAN Lists of all ports on the switch. The NO selection removes  
the default VLAN from the Port VLAN Lists of all ports, unless those  
ports have a PVID of 1 (those belonging to only the Default VLAN).  
3. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
4. Press ENTER. The message “SAVED OK” displays.  
3.4.8  
Paging Through the VLAN List  
To display additional VLANs that do not display in the current VLAN  
List as shown on the screen, use the NEXT or PREVIOUS commands  
located at the bottom of the screen, as follows:  
The NEXT and PREVIOUS fields will only display if there are  
further VLAN List entries to page through.  
NOTE  
1. To display the next screen, use the arrow keys to highlight NEXT.  
Press ENTER to view the entries on the next screen.  
2. To display the previous screen, use the arrow keys to highlight  
PREVIOUS. Press ENTER to view the entries on the previous screen.  
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Chapter 3: VLAN Configuration  
3.5  
PORT ASSIGNMENT CONFIGURATION SCREEN  
When to Use  
To select a mode of operation for each port and to assign a Port VLAN  
Identification (PVID) to each port.  
How to Access  
Use the arrow keys to highlight the PORT ASSIGNMENT  
CONFIGURATION menu item on the 802.1Q VLAN Configuration  
Menu screen and press ENTER. The Port Assignment Configuration  
screen displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
Port Assignment Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
VLAN Name  
VLAN ID  
FID  
Port  
Port Mode  
Default VLAN  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
1
2
3
4
5
6
7
8
[1D TRUNK]  
[1Q TRUNK]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
9
10  
11  
12  
RETURN  
SAVE  
PREVIOUS  
NEXT  
EXIT  
25992-06  
Figure 3-6 Port Assignment Configuration Screen  
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Port Assignment Configuration Screen  
Field Definitions  
Table 3-3 Port Assignment Configuration Screen Field Definitions  
Use this field …  
To …  
Port  
(Read-Only)  
See the port numbers of the interfaces of the current  
module.  
Port Mode  
(Selectable)  
Display the current operational mode for the  
corresponding port and select one of three modes:  
HYBRID, 1Q TRUNK, or ID TRUNK. The default is  
HYBRID.  
VLAN ID  
(Selectable)  
Select the ID number of the VLAN that is associated with  
the current port (Port VLAN ID). This is the VLAN ID into  
which any untagged frame will be classified. The default  
PVID is 0001.  
FID (Read-Only)  
Display the FID associated with the VLAN ID. This field  
updates as the associated VLAN ID field is changed.  
VLAN Name  
(Read-Only)  
Display the name that is associated with the current  
VLAN ID. If a name was not assigned to a VLAN, “NOT  
DEFINED” displays as the VLAN name.  
3.5.1  
Changing the Port Mode  
To change the operational mode of a port, proceed as follows.  
1. Use the arrow keys to highlight the PORT MODE field for the  
module and port combination you wish to change.  
2. Use the SPACE bar or BACKSPACE key to step through the available  
selections. A port may be configured for any of the following modes:  
HYBRID – This is the default mode for all ports on the switch.  
The initial PortVLAN List includes the PVID with a frame format  
of untagged. Any other VLANs desired for the Port VLAN List  
need to be manually configured. By changing the default mode to  
1Q Trunk or 1D Trunk, the Port VLAN List and the associated  
frame type are automatically configured.  
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1Q TRUNK – This mode sets the port for transmitting to another  
802.1Q aware device. In this mode, all frames are transmitted with  
a tag header included in the frame (excluding BPDUs). The switch  
will drop all untagged frames it receives on the 1Q Trunk port. The  
Port VLAN List for the port includes all VLANs.  
1D TRUNK – This mode sets the port for transmitting to a legacy  
802.1D switch fabric. In this mode, all incoming frames are  
classified into the default VLAN and all frames are transmitted  
untagged. The switch expects to receive only untagged frames  
through the 1D Trunk port. This mode also updates the Port  
VLAN List and makes the port eligible to transmit frames for all  
VLANs. The 1D Trunk mode can be used in conjunction with the  
“Forward DefaultVLAN OutAll Ports” parameter and the Default  
VLAN to allow all stations on a legacy portion of the network to  
access all stations or servers in the 802.1Q portion of the network.  
3. When the desired operational mode for the port is displayed, use the  
arrow keys to highlight the SAVE command at the bottom of the  
screen.  
4. Press ENTER. The message “SAVED OK” displays.  
3.5.2  
Assigning a VLAN ID  
each port’s VLAN ID (PVID) by stepping through a list of all configured  
VLANs. To assign a VLAN ID to a port in this manner, perform the  
following steps:  
It may be necessary to use the NEXT and PREVIOUS  
commands to page through the available ports. For  
NOTE  
instructions, refer to Section 3.5.3.  
1. Use the arrow keys to highlight the VLAN ID field for the port  
combination you wish to change.  
2. Use the SPACE bar or BACKSPACE key to step sequentially through  
the previously configured VLAN ID numbers. Only existing VLAN  
IDs will be displayed.  
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Port Filtering Configuration Screen  
New VLAN IDs must be created with the functions available on  
the Device VLAN Configuration screen, discussed in  
Section 3.4.  
NOTE  
3. When the desired VLAN ID is displayed, use the arrow keys to  
highlight the SAVE command at the bottom of the screen.  
4. Press ENTER. The message “SAVED OK” displays.  
3.5.3  
Paging Through the Port List  
To display additional ports that do not display in the current screen, use  
the NEXT or PREVIOUS commands at the bottom of the screen, as  
follows:  
The NEXT and PREVIOUS fields will only display if there are  
further Port List entries to page through.  
NOTE  
1. To display the next screen, use the arrow keys to highlight NEXT.  
Press ENTER to view the entries on the next screen.  
2. To display the previous screen, use the arrow keys to highlight  
PREVIOUS. Press ENTER to view the entries on the previous screen.  
3.6  
PORT FILTERING CONFIGURATION SCREEN  
When to Use  
To perform the following functions:  
Select a port and view a list ofVLANs that are configured to have their  
frames transmitted out that port.  
Filter out certain incoming frames according to the VLAN List and  
prevent them from being switched and transmitted out another port.  
Filter out of all incoming untagged frames so they will not be  
transmitted out another port.  
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Chapter 3: VLAN Configuration  
How to Access  
Use the arrow keys to highlight the PORT FILTERING  
CONFIGURATION menu item on the 802.1Q VLAN Configuration  
Menu screen and press ENTER. The Port Filtering Configuration screen  
displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
Port Filtering Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Port VLAN List  
VLAN ID VLAN Name  
0001  
0003  
0004  
0012  
0014  
0020  
Default VLAN  
Not Defined  
Not Defined  
Not Defined  
Not Defined  
Not Defined  
Filter Using VLAN Lists: [NO]  
Port: [002]  
Filter All Untagged Frames: [NO]  
RETURN  
SAVE  
PREVIOUS  
NEXT  
EXIT  
25992-07  
Figure 3-7 Port Filtering Configuration Screen  
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Port Filtering Configuration Screen  
Field Definitions  
Table 3-4 Port Filtering Configuration Screen Field Definitions  
Use this field …  
To …  
VLAN ID  
(Read-Only)  
See the VLAN ID of the VLANs that are configured to have  
their frames transmitted out the port selected in the Port #  
field.  
VLAN Name  
(Read-Only)  
See the names of the VLANs associated with the VLAN  
ID. If a VLAN does not have a name, “Not Defined” is  
displayed.  
Port  
(Selectable)  
To step to the port number of the interface being  
configured including the selection of ALL ports.  
Filter Using  
VLAN Lists  
(Toggle)  
Filter out (drop) frames that are classified, via their VLAN  
tag, as belonging to a VLAN that is not on the Port VLAN  
List and prevent them from being forwarded by the switch.  
This field toggles between YES and NO.YES enables  
filtering according to the Port VLAN List. NO allows the  
switch to forward the frames. The default is NO.  
Filter All  
Untagged  
Frames  
To lter out all incoming untagged frames so they will not  
be forwarded by the switch. This field toggles between  
YES and NO.YES enables the filtering of untagged  
frames. NO allows the switch to forward untagged frames.  
The default is NO.  
(Toggle)  
3.6.1  
Displaying VLAN IDs Associated with a Port  
To display the VLAN IDs and VLAN Names of the VLANs associated  
with a particular port, proceed as follows:  
1. Use the arrow keys to highlight the Port field.  
2. Use the SPACE bar or BACKSPACE key to step through the available  
port selections. The screen displays the Port VLAN List of the selected  
Port. If ALL is selected, no VLAN ID or VLAN Name information is  
displayed under Port VLAN List.  
3. To display additional VLANs that do not display in the current screen  
display, use the NEXT or PREVIOUS commands located at the  
bottom of the screen, as follows:  
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The NEXT and PREVIOUS fields will only display if there are  
further VLANs in the list to page through.  
NOTE  
4. To display the next screen, use the arrow keys to highlight NEXT.  
Press ENTER to view the entries on the next screen.  
5. To display the previous screen, use the arrow keys to highlight  
PREVIOUS. Press ENTER to view the entries on the previous screen.  
3.6.2  
Selecting the Type of Filtering for a Port  
A port can be set to filter out received frames according to its Port VLAN  
List. This keeps them from being transmitted and drops all untagged  
frames from being transmitted. To set this type of filtering, proceed as  
follows:  
1. Use the arrow keys to highlight the Port # field.  
2. Use the SPACE bar or BACKSPACE key to step through the available  
port selections.  
3. Use the arrow keys to highlight the Filter Using VLAN List field.  
4. Use the SPACE bar or BACKSPACE key to toggle between YES and  
NO. When set to YES, the switch will drop all incoming frames that  
are classified with a VLAN tag of a VLAN that does not appear on the  
Port VLAN List. The default is NO.  
5. Use the arrow keys to highlight the Filter All Untagged Frames field.  
6. Use the SPACE bar or BACKSPACE key to toggle between YES or  
NO. When set to YES, the switch will drop all incoming frames that  
do not have a VLAN tag header. The default is NO.  
7. To save the settings, Use the arrow keys to highlight the SAVE  
command at the bottom of the screen.  
8. Press ENTER. The message “SAVED OK” displays. The settings are  
saved.  
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VLAN Forwarding Configuration Screen  
3.7  
VLAN FORWARDING CONFIGURATION SCREEN  
When to Use  
To perform the following functions:  
View the ports included in a VLAN’s Forwarding List.  
Define which ports to include in the VLAN’s Forwarding List.  
Specify the formats of the frames (Tagged or Untagged) that a VLAN  
port will forward.  
How to Access  
Use the arrow keys to highlight the VLAN FORWARDING  
CONFIGURATION menu item on the 802.1Q VLAN Configuration  
Menu screen and press ENTER. The VLAN Forwarding Configuration  
screen displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
VLAN Forwarding Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Current VLAN Ports  
Port 15  
Port Type  
Frame Format  
Untagged  
Untagged  
Untagged  
Untagged  
Untagged  
Untagged  
Tagged  
Etherent Frontpanel  
Etherent Frontpanel  
Etherent Frontpanel  
Etherent Frontpanel  
Etherent Frontpanel  
Etherent Frontpanel  
ATM ELAN Finance  
ATM PVC VCI-1 VP!-23  
Port 17  
Port 20  
Port 23  
Port 24  
Port 25  
Port 35  
Port 30  
Untagged  
VLAN ID: [4094]  
VLAN Name: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  
[DELETE]  
Port: [30]  
ATM PVC VCI-1 VPI-23  
PREVIOUS NEXT  
Frame Type: [Untagged]  
RETURN  
SAVE  
EXIT  
25991-08  
Figure 3-8 VLAN Forwarding Configuration Screen  
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Chapter 3: VLAN Configuration  
Field Definitions  
Table 3-5 VLAN Forwarding Configuration Screen Field Definitions  
Use this field …  
To …  
Current VLAN  
Ports  
See the ports that are currently configured to transmit  
frames classified to the selected VLAN.  
(Read-Only)  
Port Type  
(Read-Only)  
See the MIB2 interface description for the selected switch  
port.  
Frame Format  
(Read-Only)  
See the frame format (Tagged or Untagged) for the frames  
of the selected VLAN that the port will transmit.  
VLAN ID  
(Selectable)  
Select the identification of the VLAN under examination.  
This screen displays the list of ports currently configured  
to transmit frames for the VLAN ID in this field.  
VLAN Name  
See the name associated with the VLAN ID.  
(Read-Only)  
ADD/DELETE  
(Toggle)  
Swap the action taken to add or delete a port from the  
VLAN Forwarding List.  
Port (Selectable)  
Select the port number of the interface being configured.  
The MIB2 interface description of the port appears to the  
right of the Port field. In Section 3-8, ATM PVC VCI-1  
VPI-23 is the Port Type for Port 30.  
Frame Type  
(Toggle)  
Select the format of frames (Tagged or Untagged) that will  
be transmitted by the selected port for this VLAN. The  
default is Untagged.  
3.7.1  
Viewing Current VLAN Ports  
To display the VLAN Forwarding List for a particular VLAN, proceed as  
follows:  
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE  
bar or BACKSPACE to step to the desired VLAN ID and VLAN  
Name.  
2. Press ENTER. The screen updates to display the VLAN Forwarding  
List for the selected VLAN.  
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VLAN Forwarding Configuration Screen  
3.7.2  
Paging Through VLAN Forwarding List Entries  
To display additional entries in the VLAN Forwarding List that do not  
appear on the screen, use the NEXT or PREVIOUS commands located at  
the bottom of the screen, as follows:  
1. To display the next screen, use the arrow keys to highlight NEXT.  
Press ENTER to view the entries on the next screen.  
2. To display the previous screen, use the arrow keys to highlight  
PREVIOUS. Press ENTER to view the entries on the previous screen.  
3.7.3  
Adding Forwarding List Entries  
To add a port to the VLAN Forwarding List, proceed as follows:  
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE  
bar or BACKSPACE to step to the desired VLAN ID and VLAN  
Name. Press ENTER.  
2. Use the arrow keys to highlight the Port field. Step through the  
available ports on the module with the SPACE bar or BACKSPACE.  
3. Use the arrow keys to highlight the ADD/DELETE field. Press the  
SPACE bar to select ADD or DELETE. Press ENTER.  
The Forwarding List entry will be added to the list of current VLANs  
once the configuration is saved.  
4. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
5. Press ENTER. The message “SAVED OK” displays.  
The port is added to the VLAN Forwarding List of the selected VLAN.  
3.7.4  
Deleting Forwarding List Entries  
To remove a port from the currently displayed VLAN Forwarding List,  
proceed as follows:  
1. Use the arrow keys to highlight the VLAN ID field. Use the SPACE  
bar or BACKSPACE to step to the desired VLAN ID and VLAN  
Name. Press ENTER.  
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Chapter 3: VLAN Configuration  
2. Use the arrow keys to highlight the Port field. Step through the  
available ports on the module with the SPACE bar or BACKSPACE.  
3. Use the arrow keys to highlight the ADD/DELETE field. Press the  
SPACE bar to select DEL. Press ENTER.  
The Forwarding List entry will be deleted from the list of current  
VLANs once the configuration is saved.  
4. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
5. Press ENTER. The message “SAVED OK” displays and the port is  
deleted from the VLAN Forwarding List of the selected VLAN.  
3.7.5  
Changing the Frame Format  
To change the frame format for a port, proceed as follows:  
1. Use the arrow keys to highlight the Port field. Step through the  
available ports by pressing the SPACE bar or BACKSPACE.  
2. Using the arrow keys, select the Frame Type field. Use the SPACE  
bar or BACKSPACE to toggle between Tagged or Untagged.  
3. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
4. Press ENTER. The message “SAVED OK” displays.  
3.8  
PROTOCOL VLAN CONFIGURATION SCREEN  
When to Use  
To assign a protocol to a VLAN ID on one or more ports on the switch.  
This enables the switch to add a particular VLAN identifier with the  
specified protocol to each frame that arrives on a configured port. Other  
switches receiving the frame will classify the frame according to the  
VLAN identifier within the frame. Entries may also be deleted or  
modified.  
When the frame is transmitted, it is sent to the ports associated with the  
VLAN ID as established using the Protocol Port Configuration screen.  
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Protocol VLAN Configuration Screen  
How to Access  
Use the arrow keys to highlight the PROTOCOL VLAN  
CONFIGURATION menu item on the 802.1Q VLAN Configuration  
Menu screen and press ENTER. The Protocol VLAN Configuration  
screen displays.  
Screen Example  
2E253-49R LOCAL MANAGEMENT  
Protocol VLAN Configuration  
Module Type: xxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
VLAN ID  
Protocol Type  
Configured Ports  
0001  
0002  
0x0800 (IP)  
0x0801 (CUSTOM)  
ALL PORTS  
USER DEFINED PORT LIST  
VLAN ID: [ 2 ]  
[ ENABLED ]  
[ ADD/MODIFY ]  
0x0800  
Feature Status:  
Action:  
Configure Ports: [ ALL PORTS ]  
Protocol Type:  
[
CUSTOM  
]
Ether type:  
EXIT  
SAVE  
PREVIOUS  
NEXT  
RETURN  
25991_23  
Figure 3-9 Protocol VLAN Configuration Screen  
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Chapter 3: VLAN Configuration  
Field Definitions  
Table 3-6 Protocol VLAN Configuration Screen Field Definitions  
Use this field …  
To …  
VLAN ID - upper  
part of screen  
(Selectable)  
Display the VLAN IDs currently configured and may be  
selected after the screen is saved to call up the Protocol  
Ports Configuration screen using the ENTER key.  
Protocol Type -  
upper part of  
screen  
Display the protocol type associated with the VLAN ID in  
the VLAN ID column. This field may be selected after the  
screen is saved to call up the Protocol Ports Configuration  
screen.  
(Selectable)  
Configured  
Ports  
(Selectable)  
Indicate if a VLAN ID and Protocol Type applies to all  
configurable ports or only those listed in the Protocol  
Ports Configuration screen for that Priority and Protocol  
Type. Configurable ports are all the physical ports and  
existing virtual interfaces (such as for ATM).  
VLAN ID  
(Modifiable)  
Enter the VLAN ID which will be assigned to a protocol.  
The VLAN ID may be one already created or a new one. If  
a new VLAN ID is entered, it will be added to the VLAN  
Configuration with a FID of the same value as the VLAN  
ID and a VLAN name of PROTOCOL VLAN. To enter the  
VLAN IDs, refer to Section 3.8.2.  
Configure Ports  
(Toggle)  
Apply the priority and protocol type to all or none of the  
configurable ports. The choices are:  
ALL PORTS  
NO PORTS  
NOTE: If ports are added or removed from the port list in  
the Priority Ports Configuration screen described in  
Section 3.9, the Configured Ports for the particular VLAN  
ID and Protocol Type will change from ALL PORTS or NO  
PORTS to USER DEFINED PORT LIST in the Protocol  
Priority Configuration screen  
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Protocol VLAN Configuration Screen  
Table 3-6 Protocol VLAN Configuration Screen Field Definitions (Cont’d)  
Use this field …  
To …  
Protocol Type  
Select one of the following protocol types:  
(Selectable)  
IP – pertains to all IP associated Ether Types (i.e.,  
0x0x0800, 0x0806, and, 0x8035).  
IPX – pertains to all IPX associated Ether Types (i.e.,  
0x8137, 0x8138, and special cases, 0x0100 [LLC Type 1  
Encapsulation] and 0x0101 [LLC Type 2 Encapsulation]).  
Appletalk – pertains to all Appletalk associated Ether  
Types (i.e., 0x809B and 0x80F3).  
Netbios – pertains to all Netbios associated Ether Types  
(i.e. 0x0102).  
Banyan Vines – pertains to all Banyan Vines associated  
Ether Types (i.e., 0x0103 and 0x0BAD).  
Types.  
CUSTOM – when this field is chosen, Ether Type “0x0”  
displays so the user can input a particular Ether Type.  
NOTE: Any Ether type selected or entered in the Ether  
type field and saved will become part of the selection in  
the protocol field.  
For details, refer to Section 3.8.1.  
Feature Status  
(Toggle)  
Enables or disables the entries. The entries can be made  
but are not affective until this field is set to ENABLED.The  
choices for this field are:  
ENABLED  
DISABLED  
Action  
(Toggle)  
Used to add or delete an entry (Priority) and its protocol.  
This field toggles between [ADD/MODIFY] and [DELETE].  
ADD/MODIFY– adds the new Priority and Protocol Type  
entries (for example, Priority [0] and Protocol Type  
[Banyan Vines]).  
DELETE – deletes an existing entry with the associated  
priority (for example, Priority [0] and Protocol Type  
[Banyan Vines]).  
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Chapter 3: VLAN Configuration  
Table 3-6 Protocol VLAN Configuration Screen Field Definitions (Cont’d)  
Use this field …  
To …  
Ether type  
(Modifiable)  
Enter the values of a new Ether type when CUSTOM is  
selected in the Protocol Type field.The value 0x0 will  
display, which can be modified. A protocol may have more  
that one Ether Type. Any Ether Type greater than 05dc  
(hex) and less than ffff (hex) may be entered. The  
maximum number of Ether Types configured per switch is  
32. If an attempt is made to enter more that 32, an error  
message, “ETHER TYPE TABLE FULLdisplays.  
To enter values of a particular Ether Type, refer to  
Section 3.8.2.  
3.8.1  
Displaying the Current Protocol, VLAN ID, and  
Port Assignments  
In some instances it may be desirable to see which VLAN IDs and the  
associated ports that are currently assigned to a particular protocol. To  
display this information, proceed as follows:  
1. Use the arrow keys to highlight the Protocol field at the bottom of the  
screen.  
2. Press the SPACE bar to step to the appropriate protocol.  
3. Press ENTER. The screen displays all VLAN IDs and associated ports  
currently assigned to the selected protocol.  
4. If there is more information than the screen can display, use the NEXT  
and PREVIOUS command at the bottom of the screen to display the  
information.  
3.8.2  
Assigning a Protocol Family to a VLAN ID  
To assign all Ether Types associated with a Protocol Family to a  
VLAN ID, proceed as follows:  
The list of Ether Type configurations is searched prior to the list  
of “Protocol Family” configurations when a frame is received on  
NOTE  
a switch. This means that if Ether Type of 0x0800 is configured  
on port 10 with VID of 5 and IP is configured on port 10 with  
VID of 6, the incoming frame will receive the VID 5 as Ether  
Types have priority over “Protocol Family”.  
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Protocol VLAN Configuration Screen  
1. Use the arrow keys to highlight the VLAN ID field at the bottom of  
the screen.  
2. Enter the VLAN ID. If a new VLAN ID is entered that has not been  
created on the switch, use a unique number between 2 and 4094. The  
VLAN IDs of 0, 1, and 4095 may not be used for user-defined VLANs.  
A FID will automatically be assigned to the new VLAN ID. The FID  
assigned will have the same value.  
If an illegal number is entered, the Event Message Line will display:  
”PERMISSIBLE RANGE FOR VLAN IDS: 2 to 4094” and the field  
will refresh with the previous value.  
Each VLAN ID must be unique. If a duplicate VLAN ID is  
entered, the switch assumes that the Administrator intends to  
NOTE  
modify the existing VLAN.  
3. Use the arrow keys to highlight the Protocol field at the bottom of the  
screen.  
4. Use the SPACE bar to step to the appropriate protocol type; IP, IPX,  
Appletalk, Netbios, Banyan Vines, DECNET, or CUSTOM. If  
CUSTOM is selected, Ether Type 0x0 displays. The user’s own Ether  
Type can then be entered if necessary.  
Any Ether Type entered in the Ether Type field and saved will  
become part of the selection in the Protocol field.  
NOTE  
To see if there are VLANs currently assigned to the Protocol  
displayed in the Protocol field, press ENTER.  
TIP  
5. Use the arrow keys to highlight the Configure Ports field near the  
bottom of the screen.  
6. Press the SPACE bar to toggle the field to apply the VLAN ID and  
Protocol Type entries to either ALL PORTS or NO PORTS.  
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7. If CUSTOM was selected in the Protocol Type field, use the arrow  
keys to highlight the Ether type field. Otherwise, go to step 9.  
8. Enter your particular protocol type in the Ether type field.  
9. Use the arrow keys to highlight the Action field.  
10. Press the SPACE bar to toggle the field to either ADD/MODIFY or  
DELETE the settings selected in the VLAN ID and Protocol Type  
fields.  
11. Press ENTER and the new settings are displayed under the VLAN ID,  
12. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
13. Press ENTER. The message “SAVED OK” displays and the settings  
are saved. A particular line of data displayed may now be highlighted  
to display the Protocol Ports Configuration screen, as described in  
Section 3.8.3, to view, add, or delete ports from the priority in the  
highlighted line.  
3.8.3  
Displaying the Protocol Types on Current Ports  
To display the current ports and port types associated with a VLAN ID,  
the Protocol Ports Configuration screen must be displayed. While in that  
screen, ports and their port type may be added to, or current ones deleted  
from, the VLAN ID. To access the Protocol Ports Configuration screen,  
proceed as follows:  
1. Highlight the line of information containing the VLAN ID of interest  
to display the current ports and port types associated with that VLAN  
ID. The entries in the line of information must have been saved before  
you can select it to display the Protocol Ports Configuration screen.  
2. Press ENTER. The Protocol Ports Configuration screen displays,  
showing all current ports and port types associated with that  
VLAN ID. For more information about the Protocol Ports  
Configuration screen and how to use it, refer to Section 3.9.  
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Protocol Ports Configuration Screen  
3.9  
PROTOCOL PORTS CONFIGURATION SCREEN  
When to Use  
To display the current ports and port types associated with a VLAN and  
protocol selected in the Protocol VLAN Configuration screen described in  
Section 3.8.  
The line of information selected must have been saved before it  
can be used to access the Protocol Ports Configuration screen  
NOTE  
as described below.  
How to Access  
Use the arrow keys to highlight a line of information under the VLAN  
ID/Protocol Type/Configured Ports BitMap columns in the Protocol  
Priority Configuration screen and press ENTER. The Protocol Ports  
Configuration screen displays.  
Screen Example  
6C105 LOCAL MANAGEMENT  
Protocol Ports Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Current Protocol Ports  
Port Type  
15  
30  
Ethernet  
ATM PVC VCI-1 VPI-23  
VLAN ID :  
Protocol: 0X800  
1
[ DELETE ALL PORTS ]  
Port: [ 31]  
ATM PVC VCI-1 VPI-23  
SAVE  
PREVIOUS  
NEXT  
EXIT  
RETURN  
2599_24  
Figure 3-10 Protocol Ports Configuration Screen  
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Chapter 3: VLAN Configuration  
Field Definitions  
Table 3-7 Protocol Ports Configuration Screen Field Definitions  
Use this field …  
To …  
Current  
Display the current ports associated with the VLAN ID.  
Protocol Ports  
(Read-Only)  
Port Type  
(Read-Only)  
Display the Port Type associated with the port in the  
Current Ports column.  
VLAN ID  
(Read-Only)  
Display the VLAN ID that is in the line of information  
highlighted in the Protocol VLAN Configuration screen.  
Protocol  
(Read-Only)  
Display the protocol in the line of information highlighted in  
the Protocol VLAN Configuration screen.  
Port  
(Selectable)  
Step through the ports to select a port to add of deleted  
from the VLAN ID shown in the VLAN ID field.When a port  
right of the port number. In Figure 3-10, the port is 31 and  
the associated port type is, ATM PVC VCI-1 VPI-23.  
DELETE ALL  
PORTS  
(Selectable)  
Add or delete a port selected in the Port field of the VLAN  
ID displayed, or add all ports to, or deleted all ports that  
are configurable on the device. All ports includes, all  
physical and virtual ports such as ATM ports if supported.  
In Figure 3-10, the priority is “0”. The selections are as  
follows:  
ADD PORT – adds the port selected in the Port field.  
ADD ALL PORTS – adds ALL PORTS that are  
configurable to the VLAN ID shown in the VLAN ID field.  
DELETE PORT – deletes the port selected in the Port  
field.  
DELETE ALL PORTS – deletes ALL PORTS that are  
configurable from the VLAN ID shown in the VLAN ID  
field.  
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Quick VLAN Walkthrough  
3.9.1  
Adding/Deleting Ports Associated with a VLAN ID  
To add or delete ports from a VLAN, proceed as follows:  
1. Use the arrow keys to highlight the Port field.  
2. Press the SPACE bar to step to the appropriate port number. The  
associated protocol is displayed for that port.  
3. Use the arrow keys to highlight the DELETE ALL PORTS field.  
4. Press the SPACE bar to step to the appropriate selection to ADD  
PORT,ADDALL PORTS, DELETE PORT, or DELETE ALL PORTS  
from the VLAN ID shown in the VLAN ID field.  
5. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
6. Press ENTER. The message “SAVED OK” displays and the settings  
are saved.  
3.10 QUICK VLAN WALKTHROUGH  
The procedures below provide a short tutorial walkthrough that presents  
each of the steps necessary to configure a new VLAN, assign a port to it,  
and check the Port VLAN List of the port. You may wish to follow this  
walkthrough from start to finish before attempting to configure your own  
VLANs.  
This walkthrough begins at the 802.1Q VLAN Configuration Menu  
screen for a 6C105 chassis. Follow the instructions in your device user’s  
guide to navigate to this Local Management screen.  
The screens displayed by your devices may be marginally  
different from those shown in the illustrations for this  
NOTE  
walkthrough.  
1. On the 802.1Q VLAN Configuration Menu screen, use the arrow keys  
to highlight the DEVICE VLAN CONFIGURATION menu item.  
Press ENTER. The Device VLAN Configuration screen displays.  
2. In this walkthrough, we will not change the setting of the Forward  
Default VLAN Out All Ports fields from their default setting of NO.  
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Chapter 3: VLAN Configuration  
3. Use the arrow keys to highlight the VLAN ID field. Assign a number  
to a new VLAN by typing the number “2” in the VLAN ID field.  
4. Use the arrow keys to highlight the FID field. In this example we will  
assign the new VLAN to FID 2 by typing the number “2” in the FID  
field.  
5. Use the arrow keys to highlight the VLAN Name field. Type “TEST  
VLAN” in the VLAN Name field. Press ENTER.  
6. Use the arrow keys to highlight the ADD/DEL field.  
7. Press the SPACE bar to toggle the field to ADD. Press ENTER. The  
8. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The message “SAVED OK” displays. The  
screen refreshes and VLAN 2, the TEST VLAN has been added to the  
Device VLAN Configuration screen and all learning of MAC  
addresses will be updated in FID 2. The screen should now look like  
Figure 3-11.  
This new VLAN is currently disabled, as the DISABLED field to  
the far right shows. When all the rules and settings for the  
NOTE  
VLAN are in place, it will be necessary to return to this screen  
and enable the VLAN.  
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Quick VLAN Walkthrough  
6C105 LOCAL MANAGEMENT  
Device/VLAN Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Forward Default VLAN Out All Ports: [NO]  
Admin Status  
[Enabled]  
VLAN ID  
FID  
1
VLAN Name  
DEFAULT VLAN  
TEST VLAN  
1
2
2
[Disabled]  
VLAN ID: 1  
FID: 2  
VLAN Name: TEST VLAN  
[ADD]  
RETURN  
SAVE  
EXIT  
25993-09  
Figure 3-11 Walkthrough Stage One  
It is now time to assign a port to this new VLAN.  
9. Use the arrow keys to highlight the RETURN command at the bottom  
of the screen. Press ENTER. The 802.1Q VLAN Configuration Menu  
screen displays. Use the arrow keys to select the PORT  
ASSIGNMENT CONFIGURATION menu item and press ENTER.  
The Port Assignment Configuration screen displays.  
For the purposes of this walkthrough, port 3 will be configured.  
NOTE  
10. Use the arrow keys to highlight the VLAN ID field for the module and  
port combination you wish to change.  
As this port will connect to a single workstation, and is not to be  
used for switch-to-switch communications, it is not necessary  
NOTE  
to change the PORT MODE from the default setting of  
HYBRID.  
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Chapter 3: VLAN Configuration  
11. Use the SPACE bar to step sequentially through the previously  
configured VLAN ID numbers. When the number 0002 (the new  
VLAN ID) is displayed, the FID field updates to 0002, and the VLAN  
VLAN.  
12. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. The PVID for Port 3 is now configured to  
the TEST VLAN. The TEST VLAN is also added to the Port VLAN  
List for Port 3 with a frame format of Untagged. The screen should  
now look like Figure 3-12.  
6C105 LOCAL MANAGEMENT  
Port Assignment Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
VLAN Name  
VLAN ID  
FID  
Port  
Port Mode  
Default VLAN  
Default VLAN  
TEST VLAN  
[0001]  
[0001]  
[0002]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
0001  
0001  
0002  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
0001  
1
2
3
4
5
6
7
8
[1D TRUNK]  
[1Q TRUNK]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
Default VLAN  
9
10  
11  
12  
RETURN  
SAVE  
PREVIOUS  
NEXT  
EXIT  
25992-10  
Figure 3-12 Walkthrough Stage Two  
Now that port 3 belongs to the TEST VLAN, we will designate one port  
as a 1Q Trunk port for a connection to another VLAN aware switch. This  
1Q Trunk port will carry traffic from all VLANs, allowing VLAN frames  
to maintain their VLAN ID across multiple switches.  
For the purposes of this walkthrough, port 10 will be configured  
as the trunk port.  
NOTE  
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Quick VLAN Walkthrough  
13. Use the arrow keys to highlight the Port Mode field for port 10. Use  
possible settings of the port until 1Q TRUNK is displayed.  
14. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen. Press ENTER. Port 10 is now acting as a 1Q Trunk port and  
every VLAN is in its Port VLAN List. The frame format for every  
VLAN is also set to tagged. The screen should now look like  
Figure 3-13.  
6C105 LOCAL MANAGEMENT  
Port Assignment Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
VLAN Name  
VLAN ID  
Port  
Port Mode  
DEFAULT VLAN  
DEFAULT VLAN  
TEST VLAN  
[0001]  
[0001]  
[0002]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
[0001]  
1
2
3
4
5
6
7
8
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[HYBRID]  
[1Q TRUNK]  
[HYBRID]  
[HYBRID]  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
DEFAULT VLAN  
9
10  
11  
12  
RETURN  
SAVE  
PREVIOUS  
NEXT  
EXIT  
25991-11  
Figure 3-13 Walkthrough Stage Three  
Now that the TEST VLAN and the 1Q Trunk connection are set up, we  
can proceed to activate the TEST VLAN.  
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Chapter 3: VLAN Configuration  
15. On the 802.1Q VLAN Main Menu screen, use the arrow keys to  
highlight the DEVICE VLAN CONFIGURATION menu item.  
Press ENTER. The Device VLAN Configuration screen, Figure 3-14,  
displays.  
6C105 LOCAL MANAGEMENT  
Device/VLAN Configuration  
Module Type: xxxxx-xx  
Slot Number: xx  
Firmware Revision:  
XX.XX.XX  
BOOTPROM Revision: XX.XX.XX  
Forward Default VLAN Out All Ports: [NO]  
Admin Status  
[Enabled]  
VLAN ID  
FID  
1
VLAN Name  
DEFAULT VLAN  
TEST VLAN  
1
2
2
[Enabled]  
VLAN ID: 1  
FID: 2  
VLAN Name: DEFAULT VLAN  
[ADD]  
RETURN  
SAVE  
EXIT  
25993-12  
Figure 3-14 Walkthrough Stage Four  
16. Use the arrow keys to highlight the Admin Status field of  
VLAN ID 2, the TEST VLAN.  
17. Press the SPACE bar to toggle the field to display Enabled.  
18. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
19. Press ENTER. The message “SAVED OK” displays. The switch  
activates the new VLAN.  
This effectively completes the configuration of a single VLAN, assigning  
it to a port, and configuring the switch to forward the frames received on  
that port to be forwarded with the VLAN information included in the  
frame.  
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Quick VLAN Walkthrough  
The Port VLAN List of any port on the device can also be checked at any  
time using the Port Filtering Configuration screen. A list of all ports  
eligible to transmit frames for a given VLAN will also be listed on the  
VLAN Forwarding Configuration screen. Each port can also be set to  
filter out (drop) incoming frames that have VLAN tags that do not match  
with any of those in its Port VLAN List, and also filter out all untagged  
frames received by the port. As a default neither function is activated.  
In this walkthrough, we will show how to display the Port VLAN List of  
port 10 and set the port to filter out all untagged frames that it receives.  
20. On the 802.1Q VLAN Main Menu screen, use the arrow keys to  
highlight the PORT FILTERING CONFIGURATION menu item.  
Press ENTER. The Port Filtering Configuration screen displays.  
21. Use the arrow keys to highlight the Port field.  
22. Press the SPACE bar to step the field to display 2.  
23. Use the arrow keys to highlight the Filter All Untagged Frames field.  
25. Use the arrow keys to highlight the SAVE command at the bottom of  
the screen.  
26. Press ENTER. The message “SAVED OK” displays. The Port  
Filtering Configuration screen displays the Port VLAN List for port 2  
and the Filtering All Untagged Names field is set to YES as shown in  
Figure 3-15.  
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6C105 LOCAL MANAGEMENT  
Port Filtering Configuration  
Firmware Revision:  
BOOTPROM Revision: XX.XX.XX  
Module Type: xxxxx-xx  
Slot Number: xx  
XX.XX.XX  
Port VLAN List  
VLAN ID  
0001  
VLAN Name  
DEFAULT VLAN  
1Q TRUNK  
0001  
Filter Using VLAN Lists: [NO]  
Filter All Untagged Frames: [YES]  
Port : [10]  
RETURN  
SAVE  
PREVIOUS  
NEXT  
EXIT  
25992-20  
Figure 3-15 Final Walkthrough Stage  
This effectively completes the displaying of the Port VLAN List and the  
setting of the port filtering of all untagged frames.  
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CHAPTER 4  
EXAMPLES  
This chapter provides examples of how VLAN aware SmartSwitches can  
be configured to group users at the port level to create VLANs in existing  
networks. Each example presents a problem and shows how it is solved  
by configuring the switches using the VLAN Local Management screens.  
The actual procedures and screens used to configure a VLAN aware  
switch are covered in Chapter 3, VLAN Configuration. Also provided in  
the discussion of each example is a description of how the frames  
transmitted from one user would traverse the network to its target device.  
4.1  
EXAMPLE 1, SINGLE SWITCH OPERATION  
This first example looks at the configuration of a single Ethernet switch  
for VLAN operation. In this example, two groups of three users are to be  
assigned to two VLANs to isolate them from one another. The blue users  
(B1, B2, B3) are to be kept completely separate from the red users (R1,  
R2, R3). Figure 4-1 shows the initial state of the switch.  
802.1Q Switch  
R1  
R2  
R3  
B3  
B2  
1
2
3
4
5
6
B1  
2263_11  
Figure 4-1 Example 1, Single Switch Operation  
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Chapter 4: Examples  
4.1.1  
Solving the Problem  
To set up this switch, users will be assigned to two new VLANs, red  
stations to the Red VLAN, and blue stations to the Blue VLAN. The  
information below describes how the switch is configured to create these  
two VLANs and how users are assigned to them.  
1. First, the switch is set for 802.1Q operation. Since traffic isolation is  
to be based on VLAN membership alone, the switch is set so the Red  
VLAN is a member of FID 2 and the Blue VLAN is a member of FID  
3 from the Device/VLAN Configuration screen.  
2. The Administrator uses the Device/VLAN Configuration screen to  
define the two VLANs for this switch; the Red VLAN, with a VLAN  
ID of 002, and the Blue VLAN, with a VLAN ID of 003.  
3. The Administrator brings up the Port Assignment Configuration  
screen and assigns the ports to the VLANs.  
Ports 1, 2, and 3: VLAN ID 002 (Red VLAN)  
Ports 4, 5, and 6: VLAN ID 003 (Blue VLAN)  
4. Now that the ports have been assigned, the VLANs are enabled from  
the Device/VLAN Configuration screen.  
802.1Q Switch  
R1  
R2  
R2  
B3  
B2  
1
4
VLAN ID 002 VLAN ID 003  
2
5
VLAN ID 002 VLAN ID 003  
3
6
B1  
VLAN ID 002 VLAN ID 003  
2263_12  
Figure 4-2 Switch Configured for VLANs  
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Example 1, Single Switch Operation  
The switch will now classify each frame received as belonging to either  
the Red or Blue VLANs. Traffic from one VLAN will not be forwarded to  
the members of the other VLAN, and all frames transmitted by the switch  
will be normal, untagged Ethernet frames.  
4.1.2  
Frame Handling  
This section describes the operations of the switch when two frames are  
received. The first frame is a broadcast sent by station R1.  
1. Station R1 transmits the broadcast frame. The switch receives this  
frame on Port 1. As the frame is received, the switch classifies it. The  
frame is untagged, so the switch classifies it as belonging to the VLAN  
that Port 1 is assigned to, the Red VLAN.  
2. At the same time, the switch adds the source MAC address of the  
frame and the VLAN associated with port 1 to its Source Address  
Table in FID 2. In this fashion it learns that station R1 is located out  
Port 1.  
3. Once the frame is classified, its destination MAC address is examined.  
The switch discovers that the frame is a broadcast, and treats it as it  
would any other unknown destination MAC address. The switch  
forwards the frame out all ports in the Red VLAN’s Forwarding List  
except for the one that received the frame. In this case, the frame is  
sent to Ports 2 and 3.  
The second frame is a unicast, where station R2 responds to station R1’s  
broadcast.  
4. Station R2, having received and recognized the broadcast from R1,  
transmits a unicast frame as a response. The switch receives this frame  
on Port 2. The switch classifies this new untagged frame as belonging  
to the Red VLAN.  
5. The switch adds the source MAC address and VLAN for station R2 to  
its Source Address Table in FID 2, and checks the Source Address  
Table for the destination MAC address given in the frame. The switch  
finds the MAC address and VLAN in this table, and recognizes that  
the MAC address and VLAN match for R1 is located out Port 1.  
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6. The switch examines its VLAN configuration information and  
determines that the frame for Red VLAN is allowed to be forwarded  
out Port 1 and that it must be sent in an untagged format.  
7. The switch forwards the frame out Port 1. Any other unicast  
transmissions between stations R1 and R2 will be handled identically.  
4.2  
SWITCHES  
This second example investigates the steps that must be taken to set up  
VLANs across multiple 802.1Q VLAN switches. This includes the  
configuration and operation of 1Q Trunks between 802.1Q VLAN  
switches.  
As shown in Figure 4-3, two companies, “Redco” and “Blue Industries”,  
share floors 2 and 4 in a building where the network infrastructure is  
supplied by the building owner. The objective is to completely isolate the  
network traffic of the two companies by limiting the user’s traffic through  
the ports of two switches, thus maintaining security and shielding the  
network traffic from each company. This example will show the use and  
configuration of a 1Q Trunk connection and the creation of VLANs across  
multiple switches.  
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Example 2, VLANs Across Multiple Switches  
Redco  
Blue Industries  
2
Bridge 1  
Bridge 2  
User A  
1
3
4
Blue VLAN  
Red VLAN  
4
Floor 4  
Floor 3  
Redco  
Blue Industries  
File Server  
2
File Server  
Bridge 4  
Bridge 3  
1
3
2
Blue VLAN  
Red VLAN  
Floor 2  
Floor 1  
User  
802.1D Legacy Bridge  
802.1Q VLAN Aware Switch  
22632_13  
Figure 4-3 Example 2, VLANs Across Multiple Switches  
4.2.1  
Solving the Problem  
To solve the problem in this example, the users are assigned to VLANs  
using Switch 4 and Switch 2 as shown in Figure 4-3. Redco users are  
assigned to the Red VLAN and Blue Industries users to the Blue VLAN.  
The following information shows how Switch 4 and Switch 2 are  
configured to create the two VLANs to isolate the users of the two  
companies from one another on the network using the existing  
infrastructure.  
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Chapter 4: Examples  
Switch 4  
Switch 4 is set as follows:  
1. Two VLANs are added to the list of VLANs in the Device/VLAN  
Configuration screen and assigned to a FID. In this example they are  
as follows:  
VLAN ID 2, FID 2, with a VLAN Name of Red  
VLAN ID 3, FID 3, with a VLAN Name of Blue  
Because the VLANs are assigned to two separate FIDs, the users on  
VLAN ID 2 and VLAN ID 3 cannot communicate with each other.  
2. Ports 1 and 3 are assigned to the Port VLAN ID (PVID) as follows  
using the Port Assignment Configuration screen:  
Port 1, VLAN ID: 2 for the Red VLAN  
Port 3, VLAN ID: 3 for the Blue VLAN  
This causes the switch to classify all untagged frames received as  
belonging to the VLAN specified by each port PVID and to replace the  
previous PVID information in the port VLAN List with the new PVID  
information. This makes Port 1 part of the Red VLAN, Port 3 part of  
the Blue VLAN, and both are set as VLAN frame format of untagged.  
3. Port 4 is configured as a 1Q Trunk port as follows using the Port  
Assignment Configuration screen:  
Port Mode: 1Q Trunk  
Port 4 is set as an 802.1Q Trunk port, which makes the port eligible to  
transmit to all VLANs, and all frames forwarded out this port are  
forwarded as tagged frames. By default there is no PVID associated  
with the trunk port and the port remains as a member of the Default  
VLAN. With the original classification information inserted in the  
frame Tag Header, the receiving switch will maintain the original  
frame classification.  
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Example 2, VLANs Across Multiple Switches  
Switch 2  
Switch 2 is set as follows:  
1. Two VLANs are added to the list of VLANs using the Device/VLAN  
Configuration screen and assigned to a FID. In this example they are  
as follows:  
VLAN ID 2, FID 2, with a VLAN Name of Red  
VLAN ID 3, FID 3, with a VLAN Name of Blue  
2. A Port VLAN ID is assigned to each port (1 and 3) as follows using  
the Port Assignment screen:  
Port 1, VLAN ID: 223 for the Blue VLAN  
Port 3, VLAN ID: 222 for the Red VLAN  
These settings change the configuration of the switch, so that Port 1 is  
part of Blue VLAN, Port 3 is part of Red VLAN, and both are set as  
frame type of untagged.  
3. Port 2 is configured as a 1Q Trunk port as follows using the Port  
Assignment Configuration screen:  
Port 2, Port Mode: 1Q Trunk  
Port 2 is set as an 802.1Q Trunk port, which makes its Port VLAN List  
contain all VLANs and sets all frames forwarded out this port as  
tagged frames. This completes the transmission path between  
Switch 4 and Switch 2.  
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4.2.2  
Frame Handling  
The following describes how, when User A attempts to log on to the File  
Server on Bridge 4, the frames from User A are classified on Switch 4 and  
traverse the network. In this example, the MAC address of User A is “Y”  
and the MAC address for the File Server is “Z”. The following description  
includes illustrations to help understand how the frames flow through the  
network.  
1. User A sends a frame with a Broadcast Destination Address in an  
attempt to locate the File Server. The frame is received on User A’s  
port of Bridge 1 and, because the frame is a broadcast frame, it is  
transmitted out all ports of Bridge 1 as shown in Figure 4-4.  
Redco  
Blue Industries  
Bridge 2  
Blue VLAN  
2
Bridge 1  
User A  
1
3
4
Red VLAN  
4
Floor 4  
2263_14  
Figure 4-4 Bridge 1 Broadcasts Frames  
2. Switch 4 receives the frame from Bridge 1 and immediately classifies  
it as belonging to the Red VLAN. After the frame is classified,  
Switch 4 checks the Destination Address and, upon discovering that it  
is a Broadcast Destination Address, forwards the frame out all ports in  
the Red VLAN Forwarding List excluding Port 1, which received the  
frame. In this example, it is only Port 4.  
have a dynamic entry for MAC address “Y” in FID 2. Because  
Switch 4 received the frame on Port 1, it does not forward the frame  
out that port, but does forward the frame to Port 4.  
The frame is transmitted to Switch 2 with a VLAN Tag Header  
inserted in the frame. The VLAN Tag Header indicates that the frame  
is classified as belonging to the Red VLAN. Figure 4-5 shows the path  
taken to this point to reach Switch 2.  
4-8  
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Example 2, VLANs Across Multiple Switches  
The VLAN Tag Header is inserted because Switch 4, Port 4 is  
designated as an 802.1Q Trunk port. In this case, the Port Mode setting  
for Port 4 is 802.1Q Trunk and the VLAN Frame format for that  
VLAN is tagged.  
Redco  
Blue Industries  
Bridge 2  
2
Bridge 1  
User A  
1
3
4
Blue VLAN  
Red VLAN  
4
Floor 4  
Floor 3  
Redco  
Blue Industries  
2
File Server  
Bridge 4  
Bridge 3  
1
3
2
Blue VLAN  
Red VLAN  
Floor 2  
22631_15  
Figure 4-5 Transmitting to Switch 4  
3. When Switch 2 receives the tagged frame on its Port 2, it checks the  
frame’s VLAN Tag Header and determines that the frame is classified  
as belonging to the Red VLAN, and that the frame is a broadcast  
frame. Switch 2 forwards the frame to all ports in the Red VLAN  
example, the only eligible port is Port 3, which connects to Bridge 4.  
Switch 2 checks its Forwarding List, which specifies that the VLAN  
frame type for that port is untagged. Switch 2 then updates its Source  
Address Table in FID 3 for MAC address “Y” if necessary. The  
untagged frame is then transmitted out Port 3 to Bridge 4. Bridge 4  
forwards the frame out all its ports because it is a broadcast frame, and  
the server receives it as shown in Figure 4-6.  
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Chapter 4: Examples  
Floor 3  
Redco  
Blue Industries  
2
File Server  
Bridge 4  
Red VLAN  
Bridge 3  
Blue VLAN  
3
1
2
Floor 2  
2263_16  
Figure 4-6 Transmitting to Bridge 4  
4. The File Server responds with a unicast frame to User A. All switches  
between the File Server and User A have an entry in their respective  
Source Address Tables identifying which port to use for forwarding  
the frame to User A, MAC address “Y” in FID 3. All switches update  
their Source Address Tables for the File Server’s MAC address “Z” as  
the frame is forwarded through the switch fabric to User A. The  
802.1D switches update their Source Address Tables based on the  
source MAC address and receive port and the 802.1Q switches update  
their databases based on the source MAC address, VLAN, and receive  
port.  
5. The frame from the File Server is received on Switch 2, and forwarded  
to Switch 1 as a tagged frame classified as belonging to the Red  
VLAN. Switch 1 removes the tag and forwards the frame to Bridge 1,  
which in turn forwards the frame out of the port attached to User A.  
All subsequent frames between User A and the File Server are  
forwarded through the switch fabric in the same manner.  
4.3  
EXAMPLE 3, 1D TRUNK CONNECTION TO 802.1Q  
VLAN NETWORK  
This example illustrates the use of a 1D Trunk to connect a device to a  
network of 802.1Q VLAN switches.  
In this example, a merger has taken place between the companies in the  
previous example, Redco and Blue Industries. The two companies have  
become divisions within a single corporation, Green Incorporated.  
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Example 3, 1D Trunk Connection to 802.1Q VLAN Network  
As illustrated in Figure 4-7, a third group of stations, the Green  
Incorporated staff, is added to the facility. Also, the Green Incorporated  
Network Administrators want to add a Mail Server to the network on the  
first floor.  
User B  
2
Bridge 1  
Bridge 2  
1
3
4
Blue VLAN  
Red VLAN  
4
Floor 4  
Floor 3  
2
File Server  
Bridge 4  
Bridge 3  
1
3
2
Blue VLAN  
Red VLAN  
4
Floor 2  
Green Incorporated.  
2
Mail Server  
1
3
1
Green VLAN  
Floor 1  
Server  
User  
802.1D Legacy Bridge  
802.1Q VLAN-Aware Switch  
22631_17  
Figure 4-7 Example 3, 1D Trunk Connection to 802.1Q VLAN Network  
The Green Incorporated Network Administrators want to continue to  
separate normal network traffic between the Blue and Red VLANs, and  
create a new isolated VLAN for Green, Incorporated users. All divisions  
in the facility are to have equal access to the Mail Server on the first floor.  
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Chapter 4: Examples  
4.3.1  
Solving the Problem  
Much of the existing network configuration can remain as it was for  
Example 2, VLANs Across Multiple Switches. However, the Forward  
Default VLAN Out All Ports must be set toYES on Switch 4 and 2, and a  
new 1Q Trunk port must be activated and configured on Switch 2. There  
are no other real changes to the network above the first floor.  
Switch 4  
Switch 4 is set as follows:  
1. The Forward Default VLAN Out All Ports is set to YES using the  
Device/VLAN Configuration screen. This adds the Default VLAN to  
the Port VLAN List of every switch port and all VLANs become  
members of FID 1. This allows all traffic received from the mail server  
via Switch 2 and Switch 1 to be received and classified to the Default  
VLAN of Switch 4.  
Switch 2  
Switch 2 is set as follows:  
1. The Forward Default VLAN Out All Ports is set to YES using the  
Device/VLAN Configuration screen. This adds the Default VLAN to  
the Port VLAN List of every switch port and all VLANs become  
members of FID 1.  
2. The port mode of Port 4 is set using the Port Assignment screen:  
Port 4, Port Mode: 1Q Trunk  
This causes Port 4 to be set as an additional 802.1Q Trunk port, which  
makes its Port VLAN List contain all VLANs, and all frames  
forwarded out this port are forwarded as tagged frames.  
Switch 1  
Switch 1 needs to be added to the network backbone to handle traffic from  
the Green Incorporated network and the mail server. To accomplish this  
Switch 1 is configured as follows:  
1. One VLAN is added to the list of VLANs in the Device/VLAN  
Configuration screen. In this example, Switch 1 is set as follows:  
VLAN ID 4, FID 4, with a VLAN Name of Green  
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Example 3, 1D Trunk Connection to 802.1Q VLAN Network  
2. The Forward Default VLAN Out All Ports is set to YES using the  
Device/VLAN Configuration screen. This adds the Default VLAN to  
the Port VLAN List of every switch port and all VLANs become  
members of FID 1.  
3. A Port VLAN ID is assigned to Port 1 using the Port Assignment  
screen, as follows:  
Port 1, VLAN ID: 224 for the Green VLAN  
This setting changes the configuration of the switch, so that Port 1 is  
part of the Green VLAN and is set to transmit a frame type of  
untagged.  
4. The port mode of Ports 2 and 3 are set using the Port Assignment  
screen:  
Port 2, Port Mode: 1Q Trunk  
Port 3, Port Mode: 1D Trunk  
Port 2 is set as an 802.1Q Trunk port, which makes the port eligible to  
transmit frames of all VLANs, and sets all frames forwarded out this  
port as tagged frames.  
Port 3 is set as a 1D Trunk port, where frames classified as belonging  
to any VLAN are forwarded untagged, and received frames are  
classified as belonging to the Default VLAN. This allows the Mail  
Server to send/receive mail traffic to/from all VLAN users on the  
network backbone,  
4.3.2  
Frame Handling  
The following describes how, when User B attempts to contact the Mail  
Server on Switch 1, the frames are classified on Switch 4 and traverse the  
network.  
1. User B sends a broadcast frame in an attempt to contact the Mail  
Server. The frame enters Bridge 1 and, being a broadcast, is forwarded  
to all ports. Bridge 1 learns User B’s MAC address from the Source  
Address field of the frame and adds it to its Source Address Table in  
FID 1.  
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Chapter 4: Examples  
2. Switch 4 receives the frame and classifies this new untagged frame as  
belonging to the Red VLAN. Since the frame is a broadcast, it is  
forwarded to any ports that are classified as eligible to receive Red  
VLAN frames. Switch 4 also updates its Source Address Table for  
FID 1, identifying User B as being located out Port 1.  
On Switch 4, the only port eligible to receive Red VLAN frames is  
Port 4, the 1Q Trunk. The frame is forwarded out Port 4 with the Red  
VLAN Tag header being added, as shown in Figure 4-8.  
User B  
2
Bridge 1  
Bridge 2  
1
3
4
Blue VLAN  
Red VLAN  
4
Floor 4  
2263_18  
Figure 4-8 Bridge 1 Broadcasts Frames  
3. Switch 2 receives the tagged Red VLAN frame on Port 2, as shown in  
Figure 4-9. The VLAN Tag in the frame is maintained, classifying the  
frame as belonging to the Red VLAN. The switch forwards the  
broadcast frame out all the eligible ports, Ports 3 and 4. Switch 2  
simultaneously updates its Source Address Table for FID 1 to reflect  
the location of User B (Port 2).  
The frame forwarded out Port 3 has its VLAN Tag stripped before  
transmission, and it is passed to Bridge 4 as a normal broadcast frame.  
The frame that is transmitted out Port 4, the 1Q Trunk, retains its  
VLAN tag.  
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Example 3, 1D Trunk Connection to 802.1Q VLAN Network  
Floor 3  
2
File Server  
Bridge 4  
Bridge 3  
1
3
2
Blue VLAN  
Red VLAN  
4
Floor 2  
2263_19  
Figure 4-9 Switch 2 Forwards to 1Q Trunk  
4. When Switch 1 receives the tagged broadcast frame, it also examines  
the tag and classifies the frame as belonging to the Red VLAN. This  
broadcast frame is then sent to all ports eligible to receive Red VLAN  
frames. In this case only the 1D trunk, Port 3, is eligible, as it is  
considered a member of all VLANs for forwarding purposes. The  
VLAN Tag is stripped from the frame and the frame is transmitted out  
Port 3 as shown in Figure 4-10. The Source Address Table, FID 1 for  
Switch 1 is updated to contain User B.  
Floor 2  
Green, Inc.  
2
Mail Server  
3
1
1
Green VLAN  
4
Floor 1  
2263_20  
Figure 4-10 Switch 1 Forwards to 1D Trunk  
5. The Mail Server receives the broadcast frame and recognizes it. The  
Mail Server responds with a unicast frame to User B. This frame  
crosses the 1D Trunk and is received by Switch 1. Switch 1 classifies  
the unicast frame as belonging to the Default VLAN (the only  
membership for the 1D Trunk port).  
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Chapter 4: Examples  
Switch 1 checks the Filtering Database for the MAC address of  
User B. User B’s MAC address is located, and Port 2 is identified as  
User B’s location. The frame is then checked for eligibility and frame  
format for Port 2. Since Port 2 is a 1Q Trunk port, it is eligible to  
transmit frames for all VLANs. The frame is tagged and transmitted  
out Port 2.  
The switch also recognizes the MAC address of User B in its Source  
Address Table, FID 1, and updates that table to contain the MAC  
address and port combination of the Mail Server.  
6. This tagged unicast frame is received by Switch 2. The frame is  
already tagged as belonging to the Default VLAN, so no classification  
needs to be done. The switch recognizes User B’s MAC address in its  
Source Address Table, FID 1, and updates that table to contain the  
Mail Server’s MAC address and port combination.  
The switch checks the Filtering Database for the MAC address of  
User B. User B’s MAC address is located, and Port 2 is identified as  
the location of User B. The frame is checked for eligibility and frame  
format for Port 2. Since Port 2 is a 1Q Trunk port, it is eligible to  
transmit frames for all VLANs. The frame is tagged and transmitted  
out port 2.  
7. Switch 4 receives the frame on its 1Q Trunk port, Port 4, and examines  
the frame’s Tag. The frame maintains its Default VLAN classification.  
The switch also refers to its Source Address Table, FID 1, to see if it  
can locate an entry for User B. User B is found to be located on Port 1.  
The switch also updates its Source Address Table, FID 1, with the port  
and MAC address combination for the Mail Server.  
The switch examines the Filtering Database and locates the MAC  
address entry for User B and Port 1. The frame is then checked for  
eligibility and frame format for Port 1. As Port 1 is considered eligible  
to transmit to the Default VLAN, the frame is transmitted out Port 1  
without a VLAN Tag.  
8. Bridge 1 receives the frame and recognizes User B’s MAC address.  
The frame is forwarded to the correct port and the bridge’s Source  
Address Table is updated with an entry for the Mail Server’s MAC  
address. User B receives the Mail Server’s response. Any further  
unicast traffic between the Mail Server and User B will be handled in  
the same fashion by the switches in the network.  
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Example 4, Isolating Network Traffic According to Protocol  
4.4  
EXAMPLE 4, ISOLATING NETWORK TRAFFIC  
ACCORDING TO PROTOCOL  
This final example illustrates how to restrict AppleTalk protocol traffic of  
a network to prevent unwanted multicast frames from slowing down the  
whole network and yet be able to send and receive frames associated with  
other protocols.  
In this example, illustrated in Figure 4-7, the Publications Department is  
relocating from another site to the third floor. This network will consist of  
six computers and a printer using several protocols including the  
AppleTalk protocol. A characteristic of the AppleTalk protocol is to send  
all frames as multicast frames. These multicast frames will be isolated to  
a VLAN (Grey VLAN) to prevent them from slowing down the other  
networks.  
A second VLAN (Yellow VLAN) will be established to handle traffic of  
other protocols. The Publications Department users will have access to  
the mail server on the first floor along with the Red, Blue, and Green  
VLANs.  
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Chapter 4: Examples  
User B  
2
Bridge 1  
Bridge 2  
1
1
1
3
3
3
4
4
Blue VLAN  
Red VLAN  
Floor 4  
Publications  
Grey VLAN  
2
3
7
2
Printer  
4
1
5
6
5
8
3
4
Yellow VLAN  
Floor 3  
2
File Server  
Bridge 4  
Bridge 3  
2
Blue VLAN  
Red VLAN  
4
Floor 2  
Green, Inc.  
2
Mail Server  
1
3
1
Green VLAN  
Floor 1  
User  
2599_18  
Figure 4-11 Example 4, Isolating Traffic According to Protocol  
4.4.1  
Solving the Problem  
Much of the existing network configuration can remain as it was for  
Example 3, 1D Trunk Connection to 802.1Q VLAN Network. However,  
Switch 3, Switch 5, and the devices that will make up Publication’s Grey  
VLAN have been added.  
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Example 4, Isolating Network Traffic According to Protocol  
Switch 5 will be configured to isolate all AppleTalk protocol frame traffic  
to the devices in the Grey VLAN and all other protocol traffic to the  
Yellow VLAN. Switch 3 will link the traffic from Switch 5 to the  
buildings network backbone.  
Two 1Q Trunk ports must be activated and configured on Switch 3, and  
one 1Q Trunk port must be activated and configured on Switch 4.  
Ports 2, 3, 4, 5, 6, 7, and 8 of Switch 5 are connected to the Publication  
Department devices. These ports will be configured to classify all  
AppleTalk frames into the AppleTalk VLAN (Grey). The same ports will  
also be configured to classify all other protocol frames into a second  
VLAN (Yellow). Port 1 will be assigned to the Yellow VLAN to handle  
the traffic between Switch 3 and 5.  
Switch 3  
Switch 3 is set as follows:  
1. One VLAN is added to the list of VLANs in the Device/VLAN  
Configuration screen. In this example, Switch 3 is set as follows:  
VLAN ID 5, FID 5, with a VLAN Name of Yellow  
2. The Forward Default VLAN Out All Ports is set to YES using the  
Device/VLAN Configuration screen. This adds the Default VLAN to  
the Port VLAN List of every switch port and all VLANs become  
members of FID 1.  
3. A Port VLAN ID is assigned to Port 3 using the Port Assignment  
screen, as follows:  
Port 3, VLAN ID: 5, FID 5  
4. The port mode of Ports 2 and 4 are set using the Port Assignment  
screen:  
Port 2, Port Mode: 1Q Trunk  
Port 4, Port Mode: 1Q Trunk  
Ports 2, and 4 are set as 802.1Q Trunk ports, which makes these ports  
eligible to transmit frames of all VLANs, and sets all frames  
forwarded out these ports as tagged frames. This allows traffic from  
Switch 4 to reach Switch 2 on the network backbone.  
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Chapter 4: Examples  
Switch 5  
Switch 5 is set as follows:  
1. Two VLANs are added to the list of VLANs in the Device/VLAN  
Configuration screen. In this example, it is set as follows:  
VLAN ID 5, FID 5, with a VLAN Name of Yellow  
VLAN ID 6, FID 6, with a VLAN Name of Grey  
2. The Forward Default VLAN Out All Ports is set to YES using the  
Device/VLAN Configuration screen. This adds the Default VLAN to  
the Port VLAN List of every switch port.  
3. To allow all frames (except the AppleTalk frames, which will be  
prevented in steps 4 and 5) from being transmitted out Port 1 to Switch  
3 and the network backbone, Port VLAN IDs are assigned to all switch  
ports using the Port Assignment screen, as follows:  
Port 1, VLAN ID: 5 for the Yellow VLAN  
Port 2, VLAN ID: 5 for the Yellow VLAN  
Port 3, VLAN ID: 5 for the Yellow VLAN  
Port 4, VLAN ID: 5 for the Yellow VLAN  
Port 5, VLAN ID: 5 for the Yellow VLAN  
Port 6, VLAN ID: 5 for the Yellow VLAN  
Port 7, VLAN ID: 5 for the Yellow VLAN  
Port 8, VLAN ID: 5 for the Yellow VLAN  
4. On the Protocol VLAN Configuration screen, the VLAN ID 6 of the  
Grey VLAN is assigned to the AppleTalk protocol.  
VLAN ID 6, Protocol Type: AppleTalk, Status: ADD  
This creates the protocol VLAN ID 6 that will handle only AppleTalk  
frames and enables ports to be assigned the this VLAN.  
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Example 4, Isolating Network Traffic According to Protocol  
5. The AppleTalk frames must now be restricted to Ports 2 through 8 of  
the Yellow VLAN. On the Protocol Ports Configuration screen, All  
ports except Port 1 are assigned to the AppleTalk protocol, as follows:  
Port 2, VLAN ID: 6, Protocol: AppleTalk  
Port 3, VLAN ID: 6, Protocol: AppleTalk  
Port 4, VLAN ID: 6, Protocol: AppleTalk  
Port 5, VLAN ID: 6, Protocol: AppleTalk  
Port 6, VLAN ID: 6, Protocol: AppleTalk  
Port 7, VLAN ID: 6, Protocol: AppleTalk  
Port 8, VLAN ID: 6, Protocol: AppleTalk  
Any AppleTalk frame received on ports 2 through 8 will be broadcast  
to all other ports on Switch 5 associated with the AppleTalk protocol.  
For example, if Port 2 received a frame with the AppleTalk protocol,  
Switch 5 would only transmit the frame to Ports 2, 3, 4, 6, 7, and 8.  
6. Use the VLAN Forwarding Configuration screen to assign Port 1 to  
the Yellow VLAN and set the frame type to tagged. With this  
configuration, the frames transmitted on Port 1 are tagged as being  
from the Yellow VLAN.  
If a frame associated with any protocol other than AppleTalk (for  
example, for the mail server) is received on any of the Ports 2 through  
8, the frame would be part of the Yellow VLAN and transmitted out  
Port 1 as a tagged frame to Switch 3 and handled in the same manner  
as previously described in the previous examples to route the frame to  
the Mail Server on the first floor.  
Any unicast frames received via Port 1 that are destined for a device  
in the Yellow VLAN are transmitted to the correct device. Any  
broadcast frames received via Port 1 are transmitted to all the devices  
in the Yellow VLAN and handled in a similar manner as previously  
described in Example 2.  
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Chapter 4: Examples  
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INDEX  
Numerics  
1D Trunk 1-6, 3-16, 4-10  
1Q Trunk 1-5, 3-16, 4-4  
changing 3-24  
Frames  
untagged 1-5, 2-4  
C
Chapters  
organization ix  
Configuration 2-2  
Conventions x  
Hybrid 3-15  
D
I
Default VLAN 1-5  
to Protocol 4-17  
ADD/DEL (Toggle) 3-9  
Admin Status (Toggle) 3-9  
FID - lower part of screen  
(Modifiable) 3-9  
L
FID - upper part of screen  
(Read-Only) 3-9  
Forwarding 1-5  
VLAN ID - lower part of screen  
(Modifiable) 3-9  
Local management. See managing the  
switch  
(Read-Only) 3-9  
VLAN Name - lower part of screen  
(Modifiable) 3-9  
M
Managing the switch 3-1  
E
Examples 4-1  
F
Filtering Database 1-5  
Filtering Database ID 1-4  
Forwarding list 1-5  
adding entries 3-23  
customizing 2-3  
O
Organization of chapters ix  
Other manuals x  
deleting entries 3-23  
viewing 3-22  
Forwarding mode  
802.1Q VLAN User’s Guide  
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Index  
part of screen  
Ether type (Modifiable) 3-28  
P
Port Assignment Configuration screen  
FID (Read-Only) 3-15  
Port Mode (Selectable) 3-15  
VLAN ID (Selectable) 3-15  
Filter All Untagged Frames  
(Toggle) 3-19  
(Toggle) 3-19  
Port # (Selectable) 3-19  
VLAN ID (Read-Only) 3-19  
VLAN Name (Read-Only) 3-19  
Port mode  
Related Documents x  
the switch  
1D Trunk 3-16  
1Q Trunk 3-16  
changing 3-15  
Hybrid 3-15  
S
Port VLAN list 1-5  
Protocol  
802.1Q VLAN Configuration Menu  
screen 3-5  
Current Ports - upper part of screen  
(Read-Only) 3-32  
Port Assignment Configuration  
DELETE ALL PORTS  
(Selectable) 3-32  
Port  
Protocol VLAN Configuration  
(Selectable) 3-32  
(Read-Only) 3-32  
screen 3-21  
Priority (Read-Only) 3-32  
Protocol (Read-Only) 3-32  
Protocol VLAN Configuration  
screen 3-24  
Action (Toggle) 3-27  
Configured Ports 3-26  
Station 2-1  
Switch 2-1  
T
Tag 1-5  
Tag Header 1-5  
Tagged frame 1-5, 2-5  
Index-2  
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Index  
U
Untagged frame 1-5, 2-4  
V
VLAN  
assigning ports 2-2  
components 2-1  
configuration 2-2  
default VLAN 1-5  
defining 2-2  
definition 1-1 to 1-4  
operation 2-3  
terms 1-4  
types 1-3  
VLAN Configuration  
deleting 3-12  
disabling 3-12  
enabling 3-12  
screen  
Current VLAN Ports  
(Read-Only) 3-22  
(Read-Only) 3-22  
(Toggle) 3-22  
Port (Selectable) 3-22  
Port Type (Read-Only) 3-22  
VLAN ID (Selectable) 3-22  
VLAN Name (Read-Only) 3-22  
VLAN ID 1-4  
assigning 3-16  
VLAN Local Management 3-4  
VLAN name 1-4  
802.1Q VLAN User’s Guide  
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Index  
Index-4  
802.1Q VLAN User’s Guide  
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