352CHAPTER 14: VIRTUAL LANS (VLANS)

bridge vlan define Creates a port-based VLAN on standalone systems or the (3900/9300/9400/ CoreBuilder 9000 Layer 2 modules. When you configure a port-based

9000 Layer 2) VLAN, you assign a VLAN ID (VID), a set of bridge ports, and, optionally, IEEE 802.1Q tagging.

3500

9000

9400

3900

9300

For details about this command on the CoreBuilder 3500 and CoreBuilder 9000 Layer 3 modules, see “bridge vlan define (3500/9000 Layer 3)” earlier in this chapter.

Valid Minimum Abbreviation

b v def

Important Considerations

On the SuperStack II Switch 3900 or 9300, you can define a maximum of 127 port-based VLANs on a single system.

By default, all ports are defined to be part of the default VLAN, which always uses a VID of 1 and the name Default as of Release 3.0.0. If you delete the default VLAN, you can redefine it with VID 1 only.

You cannot delete a VLAN that has an IP interface associated with it.

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

On the CoreBuilder 9000, the list of ports includes the front-panel ports and both backplane ports (even though only the lower-numbered backplane port is enabled by default). On the SuperStack II Switch 3900, the list of ports includes the 24 or 36 10/100 ports and any Gigabit Ethernet ports in use.

For the CoreBuilder 9000, keep the following considerations in mind:

When you define a VLAN on a switching module and other switching modules in the system also define this VLAN, you must define the VLAN on both the switching module and on the switch fabric module.

When you define the VLAN on the Layer 2 switching module, you must specify any front-panel ports in the VLAN as well as the module’s lower-numbered backplane port. The specified backplane port must also be tagged if you have more than one VLAN.

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

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