3Com 3500 manual Used by management, Operations, If the default, Vlan exists

bridge vlan define (3500/9000 Layer 3) 347

■When you define the VLAN on the Layer 3 switching module, you must specify any front-panel ports in the VLAN as well as the module’s backplane port. The specified backplane port must also be tagged if you have more than one VLAN and plan to communicate with VLANs on other modules on the CoreBuilder 9000 through the switch fabric module.

■When you define the VLAN on the switch fabric module, you must specify which switch fabric module backplane port is connected to the module backplane port. The switch fabric module backplane port must also be tagged if you have more than one VLAN.

■When you use a Layer 3 switching module to establish routing between VLANs on other switching modules, you can configure the backplane port of the Layer 3 switching module as part of the VLANs and then define a routing interface for each VLAN. One VLAN equals one network or subnetwork.

■For configurations that include FDDI ports, if you plan for your VLAN to include FDDI DAS ports, you must specify the lowest-numbered port in the DAS pair when defining the ports in the VLAN. See Chapter 8.

■Specify ? to see the port summary (for example, to see whether ports are associated with a trunk), and then enter the appropriate port numbers.

■The VID is used as the IEEE 802.1Q tag if tagging is enabled for a port.

Options

Prompt Description Possible Values [Default]

VID	Unique, user-defined integer
	used by management
	operations

■ If the default	Next available
VLAN exists,	VID
2 – 4094

■If the default VLAN does not exist, 1 to redefine the default VLAN, or 2 – 4094 for other VLANs