CANOGA PERKINS 9175 Command Reference - Manual (Page 119)

CanogaOS Command Reference
7-16
The Multiple Spanning Tree Protocol uses port priority as a tiebreaker to determine which port should
forward frame for a particular instance on a LAN, or which port should be the root port for an instance. A
lower value implies a better priority. In the case of the same priority, the interface index will serve as the
tiebreaker, with the lower-numbered interface being preferred over others.
The permitted range is 0-240. The priority values can only be set in increments of 16.
Examples
Switch# configure terminal
Switch(config)# interface eth-0-1
Switch(config-if)# spanning-tree 3 priority 112
Related Commands
7.25 spanning-tree instance path-cost
Use this command to set the cost of a path associated with an interface. Use the no parameter with this
command to restore the default cost value of the path.
Command Syntax
spanning-tree instance instance-id path-cost cost
no spanning-tree instance instance-id path-cost
instance-id Specify the identifier.
cost Specify the cost of path in the range of <1-200000000> (a lower path-cost
indicates a greater likelihood of the specific interface becoming a root).
Command Mode
Interface mode
Default
Assuming a 10 Mb/s link speed, the default value is configured as 2,000,000.
Usage
Before you can use this command to set a path-cost in a VLAN configuration, you must explicitly add an
MST instance to a port using the bridge-group instance command (see the example below).
Examples
Switch# configure terminal
Switch(config)# spanning-tree mst configuration
Switch(config-mst)# instance 3 vlan 3
Switch(config-mst)# exit
Switch(config)# interface eth-0-1
Switch(config-if)# spanning-tree instance 3 path-cost 1000
Related Commands