Layer 2 Switching 93
Software Release 2.6.1
C613-02025-00 REV C
switches. The Bridge Identifier parameter is used in all configuration Spanning
Tree Protocol packets transmitted by the switch. The first two octets, specified
by the PRIORITY parameter, determine the switch’s priority for becoming the
root bridge or a designated bridge in the network, with a lower number indicating
a higher priority. In fairly simple networks, for instance those with a small
number of switches in a meshed topology, it may make little difference which
switch is selected to be the root bridge, and no modifications may be needed to
the default PRIORITY parameter, which has a default value of 32768. In more
complex networks, one or more switches are likely to be more suitable
candidates for the root bridge role, for instance by virtue of being more central
in the physical topology of the network. In these cases the STP PRIORITY
parameters for at least one of the switches should be modified.
To change the STP priority value, use the command:
SET STP={stpname|ALL} PRIORITY=0..65535
The PRIORITY parameter sets the priority of the switch to become the Root
Bridge. The lower the value of the Bridge Identifier, the higher the priority. If
the PRIORITY parameter is set, either by specifying the PRIORTY or DEFAULT
parameters, the specified STP is initialised. Counters for the STP are not
affected. The default value for PRIORITY is 32768.
To restore STP timer and priority defaults, use the command:
SET STP={stpname|ALL} DEFAULT
Changing the STP PRIORITY using either of the previous commands initialises
the STP, so that elections for the root bridge and designated bridges begin
again, without resetting STP counters. To display general information about
STPs on the switch, use the command:
SHOW STP[={stpname|ALL}] [SUMMARY]
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