Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2(1) (OL-16599-01, March 2009)

Send comments to [e-mail]
2-86
Cisco Nexus 5000 Series Command Reference
OL-16599-01
Chapter 2 Ethernet Commands
spanning-tree port-priority
spanning-tree port-priority
To set an interface priority when two bridges compete for position as the root bridge, use the
spanning-tree port-priority command. The priority you set breaks the tie. To return to the default
settings, use the no form of this command.
spanning-tree [vlan vlan-id] port-priority value
no spanning-tree [vlan vlan-id] port-priority
Syntax Description
Command Default Port priority default value is 128.
Command Modes Interface configuration mode
Command History
Usage Guidelines Do not use the vlan vlan-id parameter on access ports. The software uses the port priority value for
access ports and the VLAN port priority values for trunk ports.
The priority values are 0, 32, 64, 96, 128, 160, 192, and 224. All other values are rejected.
Note Use this command to configure the port priority for Rapid PVST+ spanning tree mode, which is the
default STP mode. To configure the port priority for MST spanning tree mode, use the spacing-tree mst
port-priority command.
Examples This example shows how to increase the probability that the spanning tree instance on access port
interface 2/0 is chosen as the root bridge by changing the port priority to 32:
switch(config-if)# spanning-tree port-priority 32
Related Commands
vlan vlan-id (Optional) Specifies the VLAN identification number; the range of valid
values is from 0 to 4094.
value Port priority; valid values are from 1 to 224 in increments of 32.
Release Modification
4.0(0)N1(1a) This command was introduced.
Command Description
show spanning-tree Displays information about the spanning tree state.
spanning-tree
interface priority
Displays information on the spanning tree port priority for the interface.