Removing Trunks; Important Considerations - 3Com corebuilder 3500 Implementation Manual

Removing Trunks

Important
Considerations
You cannot change some port characteristics within a trunk. For
example, in an FDDI trunk, you cannot change a trunked DAS port to
a SAS port.
Here is an example of how to change the FDDI station mode of a
trunk:
a Remove the desired trunk.
b Reboot and then change the station mode.
c Reboot and redefine the trunk (and any affected VLANs).
d Reboot.
To avoid configuration errors, do not modify FDDI-station mode port-pairs
when any of the ports in the pair are members of a trunk.
You can remove one, several, or all trunks using a single
command. This saves having to reboot the system after each trunk
remove.
If you remove a Gigabit Ethernet module that has trunks defined,
NVRAM is not cleaned up, but the trunk ports are available for use by
a replacement module of the same type.
Because each Gigabit Ethernet module uses an internal trunk resource
towards the system limit of four, keep in mind how many trunk
resources may be used when you remove a trunk. For example, if your
system has a trunk with two Gigabit Ethernet ports (which
consolidates two trunk resources into one) plus three other trunks,
and you then try to untrunk the two Gigabit Ethernet ports, you will
exceed the trunk resource limit. The untrunked Gigabit Ethernet ports
try to take over two separate trunk resources (for an illegal total of 5),
and the system sends a warning message like the following:
Unable to remove trunk(s).
Internal trunk resource limit would be exceeded.
Removing Trunks 153
remove