3Com 4007, Implementation Manual, Page: 231 / 684

Defining Trunks
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When automatic backplane trunking is enabled , consider these issues:
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No trunking can be performed on the 2-port or 4-port GEN
interface module.
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Layer 2 and Multilayer Switching Modules with multiple backplane
ports can use the maximum trunk groups available from the switch
fabric module to the specific slot.
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Layer 2 and Multilayer Switching Modules with a single backplane
port cannot be trunked.
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When automatic backplane trunking is disabled , consider these issues:
■
Trunking can be performed on the 4-port GEN interface module
between slots containing other GEN interface modules.
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Trunking is allowed on a minimum of two backplane port when
using Multilayer Switching Modules with multiple backplane ports
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Trunking is allowed on Layer 2 modules with trunk max traces
available
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No trunking is allowed on either Layer 2 or Multilayer Switching
Modules with a single backplane port
Defining Trunks
To define a trunk, you specify the ports that you want to be in the trunk.
Important
Considerations
■
If you have already defined other trunks on your Switch, you cannot
select ports that are part of an existing trunk.
■
Devices that you use in a trunking configuration must have the
hardware to support the trunking algorithm.
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You can define one or several trunks using a single
define
command. This capability saves you from having to reboot the Switch
after each trunk define.
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When you define a trunk, you specify ports and characteristics
associated with the trunk (including Gigabit Ethernet flow control).
You can specify them all in one
define
operation.
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When you create the trunk, the entire trunk assumes the current port
characteristics.
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Trunk names cannot be longer than 32 characters (no spaces allowed).