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C
HAPTER
3: R
ELEASE
I
SSUES
These control addresses are included in the bridge display address
count field, but are not listed in the bridge port address list.
Resilient Links
■
The 36-port 10/100BASE-TX Desktop Switching Modules (Model
Numbers 3CB9LF36RL and 3CB9LF36TL) do not support resilient links.
The modules have only one backplane port.
IGMP
■
Do not allow a 36-port 10/100BASE-TX Desktop Switching Module
(Model Number 3CB9LF36RL or 3CB9LF36TL) to act as an IGMP
Querier. If you do, the module floods multicast traffic if it does not
receive report packets on its front-panel ports. Use the
bridge
multicast igmp queryMode disable
option to turn off querying for
the module. (29208)
Trunking
■
Make trunking definitions and modifications only from the
Administration Console command line interface, and not through
SNMP.
■
When you add ports to an existing trunk, and change the port mode
in the same modify operation, you need to reset the module and
modify the trunk twice to add the additional ports to the trunk. The
port mode is updated after the first reset operation. You can add a
port to a trunk without changing the port mode in a single modify
operation. (29804)
■
3Com recommends that you enable the Trunk Control Message
Protocol (TCMP) on each end station of a trunk. If this protocol is not
enabled on both end stations, TCMP cannot correctly validate trunk
configuration rules. (29581)
■
The 36-port 10/100BASE-TX Desktop Switching Modules (Model
Numbers 3CB9LF36RL and 3CB9LF36TL) do not support port
trunking.
VLANs
■
The maximum number of virtual LANs (VLANs) that you can define in
a CoreBuilder 9000 system is 127. You may not be able to add every
bridge port in the system to every VLAN that you have defined.
■
When the
vlan remove all
command is executing, it may take
several minutes to remove all VLANs when the system is operating in
allClosed mode.
■
The 36-port 10/100BASE-TX Desktop Switching Modules (Model
Numbers 3CB9LF36RL and 3CB9LF36TL) support only open VLANs.
The modules do not support closed VLANs.