3Com 3500 manual Bridge trunk define, Important Considerations

bridge trunk define 307

bridge trunk define

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Defines one or more trunks on the system. When you define a trunk, you specify ports and characteristics for the trunk.

Valid Minimum Abbreviation

b t def

Important Considerations

■If you have more than one media type on your system (for example, Fiber Distributed Data Interface (FDDI), Fast Ethernet, and Gigabit Ethernet), you are prompted for a media type before you are prompted for the trunk information.

■All links to be trunked must be homogeneous. For example, you cannot mix Fast Ethernet and Gigabit Ethernet links in a trunk.

■If you have already defined other trunks on your system, you cannot select ports that are part of an existing trunk.

■In general, create trunks before you define your virtual LANs (VLANs). If you create a trunk whose ports are part of existing VLANs, the VLAN bridge port configuration changes. For example, if you have the default VLAN as well as IP VLANs and you then define a trunk with ports in one of the IP VLANs, the system removes those ports from that VLAN and places them in the default VLAN. You must modify the VLAN and add the new bridge ports to the appropriate VLAN. This situation does not apply if you have only the default VLAN (all ports are part of the default VLAN).

■When you define a VLAN to include trunk ports, specify the anchor port (lowest-numbered port) that is associated with the trunk.

■Do not use Gigabit Ethernet (GEN) Interface modules (such as the

2-port 1000BASE-SX Gigabit Ethernet (GEN) Interface Module) when defining trunks.

■Enter ? to see the port summary (for example, to indicate whether there are ports associated with FDDI Dual Attach Station (DAS) pairs), and then enter the appropriate port numbers. To specify an FDDI DAS pair, specify the lowest-numbered port in the DAS pair.

■The number of trunk groups and the number of ports within a trunk group depend on your system. See the Options table.

The 3CB9FG24T switch fabric module supports up to 12 trunk groups on the CoreBuilder 9000.