3Com 4007, Implementation Manual, Page: 169 / 684

Key Guidelines for Implementation 169
STP Not Compatible
with Resilient Links
If you want to define one or more resilient link pairs on a Layer 2
Switching Module, STP cannot be enabled:
■
If STP is enabled and you define a resilient link pair, the module rejects
it toward the end of the definition process.
■
If you have one or more resilient links defined (STP is disabled) and you
try to enable STP, the module rejects this request. You cannot enable
STP until you remove all resilient link pairs.
Bridge Ports and
Trunks
When you are prompted to select ports, you can specify the
?
option to
see a matrix of information about your bridge ports, including a Selection
column, a Port column, and a Label column.
■
Without trunks configured, the Selection and Port columns contain
the same port numbers, which indicates that you can select each port.
■
With trunks configured, the Selection column indicates that you can
select the anchor port (lowest-numbered port) in the trunk, and the
Port column shows each port that is associated with the trunk. The
Label column contains the trunk name, if you have assigned one.
Multicast Limits and
Trunks
If you want to specify a multicast limit for a trunk, be sure to apply it to
the trunk’s anchor port (lowest-numbered port) only. However, be aware
that the multicast limit will operate on
each port in the trunk, even
though you did not actively configure it that way. For example, if you
have a trunk that consists of four ports and if you configure the anchor
port with a multicast limit of 3000 pps, each of the four ports will operate
with a 3000 pps limit.
Bridge Port Addresses
in Closed VLAN Mode
If you are using
allClosed
for the VLAN mode and you want to
administer bridge port address options in some way, be sure that you
specify the correct VLAN interface index, because each VLAN in
allClosed
mode operates with a unique address table.
GVRP Usefulness Configuring GARP VLAN Registration Protocol (GVRP) on Multilayer
Switching Modules is useful only when there are several other switches or
endstation NICs in the network that also support GVRP.