Cisco WS-C2948G-GE-TX - Configuring MST; Enabling MST

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Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Chapter 7 Configuring Spanning Tree
Configuring MST
Configuring MST
The following sections describe how to configure MST:
Enabling MST
To enable and configure MST on the switch, perform this task in privileged mode:
These examples show how to enable MST:
Console> (enable)
Console> (enable) set spantree mode pvst
Spantree mode set to PVST+.
Console> (enable) show spantree active
VLAN 1
Spanning tree mode PVST+
Spanning tree type ieee
Spanning tree enabled
Designated Root 00-50-3e-66-d0-00
Designated Root Priority 24576
Designated Root Cost 104
Designated Root Port 6/1
Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec
Bridge ID MAC ADDR 00-10-7b-bb-2f-00
Bridge ID Priority 32768
Bridge Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec
Port Vlan Port-State Cost Prio Portfast
Channel_id
------------------------ ---- ------------- --------- ---- --------
----------
6/1 1 forwarding 4 32 disabled 0
6/2 1 blocking 4 32 disabled 0
Console> (enable)
Task Command
Step 1
Begin in PVST+ mode. set spantree mode mst [mistp | pvst+ | mistp-pvst+ | mst]
Step 2
Display the STP ports. show spantree active
Step 3
Configure the MST region. set spantree mst config {[name name] | [revision number]
[commit | rollback | force]}
Step 4
Verify your configuration. show spantree mst config
Step 5
Map VLANs to the MST instance. set spantree mst instance vlan vlan
Step 6
Commit the new region mapping. set spantree mst config commit
Step 7
Enable MST. set spantree mode mst [mistp | pvst+ | mistp-pvst+ | mst]
Step 8
Verify your MST configuration. show spantree mst config
Step 9
Verify your MST instance configuration. show spantree mst instance
Step 10
Verify your MST module and port
configuration.
show spantree mst mod/port