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Chapter 7
Configuring Spanning Tree
Default 200000
Console> (enable) set spantree portinstancecost 4/1 cost 6000 mst 4000
Command successful. Modified port 4/1 configuration:
Default 200000
Console> (enable) show spantree portinstancecost 4/1
This command is not valid when STP is in MST mode.
Console> (enable) show spantree portinstancecost 4/1 mst
Port 4/1 cost configuration:
Default 200000
Console> (enable)
Configuring the MST Port Instance Priority
You can set the port priority for an instance of MST. The port with the lowest priority value for a specific
MST instance forwards the frames for that instance. The possible port instance range is 0–240. If all
ports have the same priority value for an MST instance, the port with the lowest port priority number
forwards the frames for that instance.
You can assign a different port instance priority for instances within a trunk port.
To configure the port instance priority on an MST instance, perform this task in privileged mode:
Task
Step 1
Configure the port instance priority on an MST
instance.
Step 2
Verify the port instance priority setting.
This example shows how to configure the port instance priority on an MST instance and verify the
configuration:
Console> (enable) set spantree portinstancepri 4/1 16 mst 2
Command successful. Modified port 4/1 configuration:
Default 32
Console> (enable) set spantree portinstancepri 4/1 48 mst 200
Command successful. Modified port 4/1 configuration:
Default 32
Console> (enable) show spantree mst 4/1
Edge Port:
Link Type:
Port Guard:
Boundary:
OL-8978-04
---------- ---------------------------------------------------------
5000
4
0-3,5-4094
Cost
Instances
---------- ---------------------------------------------------------
5000
4
6000
4000
0-3,5-3999,4001-4094
Cost
Instances
---------- ---------------------------------------------------------
5000
4
6000
4000
0-3,5-3999,4001-4094
Priority
Instances
---------- ---------------------------------------------------------
16
2
0-1,3-4094
Priority
Instances
---------- ---------------------------------------------------------
16
2
48
200
0-1,3-199,201-4094
No, (Configured) Default
P2P, (Configured) Auto
Default
No
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring Multiple Spanning Tree on the Switch
Command
set spantree portinstancepri mod/port
priority mst [instance]
show spantree mst [instance | mod/port]
7-57
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Troubleshooting
