Spanning-Tree Port-Priority - Cisco Catalyst 4500 Series Command Reference Manual

spanning-tree port-priority

spanning-tree port-priority
To prioritize an interface when two bridges compete for position as the root bridge, use the
spanning-tree port-priority command. The priority you set resolves the conflict. To revert to the
default setting, use the no form of this command.
Syntax Description
port_priority
Defaults
Port priority value is set to 128.
Command Modes Interface configuration mode
Command History Release
12.1(8a)EW
Examples This example shows how to increase the possibility that the spanning-tree instance 20 will be chosen as
the root-bridge on interface FastEthernet 2/1:
Switch(config-if)# spanning-tree port-priority 0
Switch(config-if)#
Related Commands Command
spanning-tree cost
spanning-tree portfast default
spanning-tree portfast (interface
configuration mode)
spanning-tree uplinkfast
spanning-tree vlan
show spanning-tree
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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spanning-tree port-priority port_priority
no spanning-tree port-priority
Port priority; valid values are from 0 to 240 in increments of 16.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Description
Calculates the path cost of STP on an interface.
Enables PortFast by default on all access ports.
Enables PortFast mode.
Enables the UplinkFast feature.
Configures STP on a per-VLAN basis.
Displays spanning-tree state information.
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