Cisco WS-C6506 User Manual

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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 7 Configuring Spanning Tree
Configuring Multiple Spanning Tree on the Switch
Console> (enable) show spantree mst 1
Spanning tree mode MST
Instance 1
VLANs Mapped: 2-10
Designated Root 00-00-00-00-00-00
Designated Root Priority 0 (root priority: 0, sys ID ext: 0)
Designated Root Cost 0 Remaining Hops 0
Designated Root Port 1/0
Bridge ID MAC ADDR 00-d0-00-4c-18-00
Bridge ID Priority 32769 (bridge priority: 32768, sys ID ext: 1)
Port State Role Cost Prio Type
------------------------ ------------- ---- --------- ---- --------------------
Console> (enable) show spantree mst 7/2
Edge Port: Yes, (Configured) Enable
Link Type: P2P, (Configured) Auto
Port Guard: Default
Boundary: No
Hello: 2, (Local bridge hello: 2)
Inst State Role Cost Prio VLANs
---- ------------- ---- --------- ---- -----------------------------------
0 forwarding DESG 20000 32 1
Console> (enable) show spantree mst config
Current (NVRAM) MST Region Configuration: 5 instances
Configuration Name: cisco Revision: 1
Instance VLANs
-------- --------------------------------------------------------------
0 1,11-20,51-4094
1 2-10
2 21-30
3 31-40
4 41-50
=======================================================================
Console> (enable)
Configuring the MST Bridge ID Priority
You can set the bridge ID priority for an MST instance when the switch is in MST mode.
The bridge priority value is combined with the system ID extension (the ID of the MST instance) to
create the bridge ID priority. You can set 16 possible bridge priority values: 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440.
To configure the bridge ID priority for an MST instance, perform this task in privileged mode:
The example shows how to configure the bridge ID priority for an MST instance:
Console> (enable) set spantree priority 8192 mst 3
set spantree priority 8192 mst 3
MST instance 3 bridge ID priority set to 8195
(bridge priority: 8192 + sys ID extension: 3)
Task Command
Step 1
Configure the bridge ID priority for an
MST instance.
set spantree priority bridge_priority mst [instance]
Step 2
Verify the bridge ID priority. show spantree mst [instance | mod/port]

Cisco WS-C6506 Specifications

General

Brand	Cisco
Model	WS-C6506
Category	Switch
Language	English