Configuring Mst Instance Parameters - Cisco Catalyst 4500 Series Configuration Manual

Chapter 20 Configuring STP and MST
Switch(config-mst)# instance 1 vlan 2000-3000
Switch(config-mst)# no instance 1 vlan 1500
Switch(config-mst)# show pending
Pending MST configuration
Name
Revision
Instance
--------
0
1
-------------------------------------------------------------------------------
Switch(config-mst)# end
Switch(config)# no spanning-tree mst configuration
Switch(config)# end
Switch# show spanning-tree mst configuration
Name
Revision
Instance
--------
0
-------------------------------------------------------------------------------

Configuring MST Instance Parameters

To configure MST instance parameters, perform this task:
Command
Step 1
Switch(config)# spanning-tree mst X priority Y
Step 2
Switch(config)# spanning-tree mst X root [primary |
secondary]
Step 3
Switch(config)# Ctrl-Z
Step 4
Switch# show spanning-tree mst
This example shows how to configure MST instance parameters:
Switch(config)# spanning-tree mst 1 priority ?
<0-61440>
Switch(config)# spanning-tree mst 1 priority 1
% Bridge Priority must be in increments of 4096.
% Allowed values are:
0
32768 36864 40960 45056 49152 53248 57344 61440
Switch(config)# spanning-tree mst 1 priority 49152
Switch(config)#
Switch(config)# spanning-tree mst 0 root primary
mst 0 bridge priority set to 24576
mst bridge max aging time unchanged at 20
mst bridge hello time unchanged at 2
mst bridge forward delay unchanged at 15
Switch(config)# ^Z
Switch#
OL-25340-01
[cisco]
2
Vlans mapped
---------------------------------------------------------------------
1-1999,2500,3001-4094
2000-2499,2501-3000
[]
0
Vlans mapped
---------------------------------------------------------------------
1-4094
bridge priority in increments of 4096
4096 8192 12288 16384 20480 24576 28672
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Purpose
Configures the priority for an MST instance.
Configures the bridge as root for an MST instance.
Exits configuration mode.
Verifies the configuration.
Configuring MST
20-31