Vlan Ids - 3Com corebuilder 3500 Implementation Manual

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VLAN IDs

Each VLAN is identified by its VLAN ID (VID). For VLANs that you create,

the system keeps track of its used VLAN ID numbers to help you select

the next available VLAN ID. Outgoing data frames are tagged per

IEEE 802.1Q (which specifies the VID) if tagging is enabled on the

transmit port for that VLAN. Tagged IEEE 802.1Q data frames that are

received on the system are assigned to the VLAN that corresponds to

both the VID contained in the tag and the protocol type.

Be aware of these additional guidelines:

The default VLAN always uses the reserved VID of 1.

Before you assign a VID, review the information in Table 15.

Table 15 Assigning ID Numbers to VLANs

If you rely on dynamic configuration to create a port-based VLAN

based on GVRP updates, the VID is the unique IEEE 802.1Q VID.

When you define a router port IP interface, the system automatically

creates a router port IP VLAN and assigns it the next available VID. See

Chapter 11 for information on router port IP interfaces.

Reserved for the default VLAN assigned by IEEE and

3Com Corporation

Numbers that you assign when you create VLANs