3Com 4007 Implementation Manual page 232

232 C 12: T
HAPTER RUNKING
3Com recommends that the TCMP state be enabled. But devices
can operate without TCMP. When TCMP is not in effect on a
point-to-point link, its configuration validation is simply absent.
If your Switch has more than one media type (for example, Fast
Ethernet and Gigabit Ethernet), you are prompted for a media type
before you are prompted for the trunk information.
Trunk names become the port labels when you display information on
the trunks.
All ports in the trunk are set to the selected operating mode
(half-duplex or full-duplex).
Each Gigabit Ethernet (GEN) Switch Fabric Module (Model Number
3CB9FG24T) that you install provides port trunking support for
12 groups, with up to six ports in a group (12x6).
When you create a VLAN that includes ports that are part of a trunk,
specify the anchor port (lowest-numbered port) that is associated with
the trunk. For example, if ports 1 through 3 are associated with a
trunk, specifying port 1 defines the VLAN to include all of the physical
ports in the trunk. If you have not defined trunks, simply specify one
or more port numbers, or specify all to assign all ports to the VLAN
interface.
When you create a trunk that includes ports that are part of a VLAN,
those ports are removed from the VLAN. You must modify the VLAN
and add the new bridge port to the appropriate VLAN. This situation
does not apply to the default VLAN (all ports are part of the default
VLAN, including the trunk's anchor port).
Layer 2 modules have two backplane ports and Multilayer modules
have one backplane port. If you have more than one backplane port
between the fabric module and the interface module, you can trunk
those ports together.
You have to setup trunking on both the interface module and the
switch fabric module sides. After you do this, the trunk comes up, but
only one port is active within the trunk. Therefore, before you define
the trunks using backplane ports, manually enable the second
backplane port on the interface module.
Entering an nvData reset command erases all previous trunk
information.