Configuring Mst Instance Port Parameters - Cisco Catalyst 4500 Series Configuration Manual

Configuring MST
Switch# show spanning-tree mst
###### MST00
Bridge
Root
Configured
Interface
---------------- ---- --- --------- -------- --------------------------------
Fa4/4
Fa4/5
Fa4/48
###### MST01
Bridge
Root
Interface
---------------- ---- --- --------- -------- --------------------------------
Fa4/4
Fa4/5
Fa4/48
Switch#

Configuring MST Instance Port Parameters

To configure MST instance port parameters, perform this task:
Command
Step 1
Switch(config-if)# spanning-tree mst x cost y
Step 2
Switch(config-if)# spanning-tree mst x port-priority y
Step 3
Switch(config-if)# Ctrl-Z
Step 4
Switch# show spanning-tree mst x interface y
This example shows how to configure MST instance port parameters:
Switch(config)# interface fastethernet 4/4
Switch(config-if)# spanning-tree mst 1 ?
cost
port-priority
Switch(config-if)# spanning-tree mst 1 cost 1234567
Switch(config-if)# spanning-tree mst 1 port-priority 240
Switch(config-if)# ^Z
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
20-32
vlans mapped:
address 00d0.00b8.1400
this switch for CST and IST
hello time 2, forward delay 15, max age 20, max hops 20
Role Sts Cost
Back BLK 1000
Desg FWD 200000
Desg FWD 200000
vlans mapped:
address 00d0.00b8.1400
this switch for MST01
Role Sts Cost
Back BLK 1000
Desg FWD 200000
Boun FWD 200000
Change the interface spanning tree path cost for an instance
Change the spanning tree port priority for an instance
11-4094
priority 24576 (24576 sysid 0)
Prio.Nbr Status
240.196 P2p
128.197 P2p
128.240 P2p Bound(STP)
1-10
priority 49153 (49152 sysid 1)
Prio.Nbr Status
160.196 P2p
128.197 P2p
128.240 P2p Bound(STP)
Purpose
Configures the MST instance port cost.
Configures the MST instance port priority.
Exits configuration mode.
Verifies the configuration.
Chapter 20 Configuring STP and MST
OL-25340-01