3Com 9000 manual Before assigning a VID, review the information in Table, Number Description

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46CHAPTER 4: ADVANCED MANAGEMENT TASKS

■For backplane ports and switch fabric module ports, you must use tagging when these ports are shared by multiple VLANs. (Only one VLAN’s backplane ports can be untagged; in all other VLANs defined across the backplane, the backplane ports must be tagged.) If you tag the backplane port of a switching module for a VLAN, you must also tag the corresponding switch fabric module port in that VLAN.

Devices (end stations, routers, switches, and so forth) that are connected to an explicitly tagged front-panel port must be capable of supporting 802.1Q tagging. If the front-panel port is untagged in the VLAN to which they belong, however, they do not have to support 802.1Q tagging.

VLAN IDs Each VLAN is identified by its VLAN ID (VID). For the VLANs you create, each module keeps track of its used VLAN ID numbers to help you select the next available VLAN ID. Data frames sent by the module are tagged per IEEE 802.1Q (which contains the VID) if tagging is enabled on the transmit port for that VLAN. Tagged IEEE 802.1Q data frames that are received on the module are assigned to the VLAN that corresponds to the VID contained in the tag. The default VLAN uses a VID of 1.

Before assigning a VID, review the information in Table 6.

Table 6 Assigning ID Numbers to VLANs

VLAN ID

 

Number

Description

VID 0

The null VID. You cannot define or configure VLANs with

 

an ID of 0 on a module.

VID 1

Default VLAN assigned by IEEE and 3Com Corporation

VID 4095

Reserved

VID 2–4094

Numbers that you assign when you create VLANs

Terminology Review the following terms:

■Default VLAN — The port-based VLAN interface that is predefined on all Switch Fabric ports and the ports of each switching module without any tagging.

■Protocol suite — On Layer 3 modules, refers to the protocol family associated with a protocol-based or network-based VLAN. The protocol suite is unspecified for the default VLAN and all port-based VLANs.

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Contents Device View User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Index About this Guide Information This Guide Finding SpecificIf you are looking to Turn to Icon Description ConventionsConvention Description Year RelatedDocumentation ComplianceAbout Device View About Device View Description Agent 3Com Version Part Number Management Support MatrixManagement Support Matrix About Device View Using Device View Using Device View Starting PreparingPlatform Device ViewCentral Power Supply/Fan left Color indicates status Managing a CoreBuilder 9000 SwitchManaging Media Modules Segments, Ports Filtering with the Media Selection Bar Using Device View Using Tabs in the Notebook Interface Device View Help for Security Settings Managing Devices Managing SwitchesDevice Settings CoreBuilderIP Configuration Settings Chassis SettingsModule Settings Bridge Settings RAP SettingsManaging Devices Managing Power Systems Managing CoreBuilder Switch Power Supply Admin StatusOverheat Power Down Mode Power Class ModulePower State Managing Devices Advanced Management Tasks Statistics ViewingPerformance On the type of port or device that you select1Virtual LAN Support 1Virtual LAN Support Managing Virtual LANs Advanced Management Tasks Vlan Features Layer Modules Switch Feature Fabric DescriptionLayer Modules Switch Fabric Feature Description Ieee 802.1Q is a standard for VLANs. It aims to Before assigning a VID, review the information in Table Number DescriptionManaging Virtual LANs Advanced Management Tasks Filtering Vlan Selections Deleting VLANs Index Index
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