Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands set spantree priority
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Catalyst 6500 Series Switch Command Reference—Release7.6
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set spantree priority
To set the bridge priority for a VLAN or an instance when PVST+ or MISTP is running, use the set
spantree priority command.
set spantree priority bridge_priority vlans
set spantree priority bridge_priority mistp-instance instances
set spantree priority bridge_priority mst instances
Syntax Description
Defaults The default is the bridge priority is set to 32768.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines This command is not supported by the NAM or the MSM.
If MISTP or the MAC reduction feature is enabled, valid bridge_priority values are 0, 4096, 8192,
12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056 , 491 52, 53 248 , 573 44, a nd 61 440,
with 0 indicating high priority and 61440, low priority.
If MISTP or the MAC reduction feature is disabled, valid bridge_priority values are from 0 to 65535.
If you enable MISTP, you cannot set the VLAN bridge priority.
If you enable PVST+, you cannot set the instance priority.
If you try to set instance priority with PVST+ enabled, this message is displayed:
This command is only valid when STP is in MISTP or MISTP-PVST+ mode.
Examples This example shows how to set the bridge priority of instance 3:
Console> (enable) set spantree priority 14 mistp-instance 3
Instance 3 bridge priority set to 14.
Instance 3 does not exist.
Your configuration has been saved to NVRAM only.
Console> (enable)
bridge_priority Number representing the priority of the bridge; see the “Usage Guidelines”
section for valid values.
vlans Number of the VLAN; valid values are from 1 to 1005 and from 1025 to 4094.
mistp-instance
instances Specifies the instance numbers; valid values are from 1 to 16.
mst instances Specifies the MST instance numbers; valid values are from 1 to 15.