3Com 4007, Implementation Manual, Page: 227 / 684

Key Guidelines for Implementation
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Each TCMP agent:
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Periodically transmits a TCMP helloMessage through every trunk port.
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Continuously listens for helloMessages from other trunk ports.
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Builds a list of ports that TCMP has detected.
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Uses this list to activate or deactivate trunk ports to maintain valid
trunk configurations.
TCMP uses three trunk port states to control port activation and
deactivation:
■
notInUse — A trunk port in this state has not been selected to
participate in the trunk.
■
selected — TCMP has selected the trunk port to participate in the
trunk, but the port has not yet become active .
■
inUse — A trunk port is fully active on the trunk.
Key Guidelines for
Implementation
Consider the following important factors when you implement and
configure trunks:
General Guidelines
■
Create trunks before you define VLANs.
■
An interface module supports four point-to-point trunks, each built
from up to eight ports. All channels in a trunk must connect:
■
Correctly configured ports
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Identical types of ports (with no two ports on a trunk connected to
the same network)
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Identical types of network nodes (switches or servers)
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You cannot mix Fast Ethernet and Gigabit Ethernet links in a trunk. All
links to be trunked must be homogeneous.
■
You can create a trunk on modules through the backplane using a
switch fabric module and any other switching module.