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Chapter 7
Configuring Spanning Tree
Port
------------------------ ---- ------------- --------- ---- -------- ----------
1/1
3/1
3/25
3/26
3/27
3/28
3/29
3/30
7/1-4
7/5
7/6
8/37
8/38
15/1
16/1
Console> (enable)
Configuring the MISTP Port Priority
You can configure the port priority of ports. The port with the lowest priority value forwards frames for
all VLANs. The possible port priority value is a multiple of 16 from 0–240. The default is 32. If all ports
have the same priority value, the port with the lowest port number forwards frames.
To configure the port priority for a port, perform this task in privileged mode:
Task
Step 1
Configure the MISTP port priority for a port. set spantree portpri mod/port
Step 2
Verify the port priority setting.
This example shows how to configure the port priority and verify the configuration:
Console> (enable) set spantree portpri 1/1 32
Bridge port 1/1 port priority set to 32.
Console> (enable) show spantree mistp-instance 1
Instance 1
Spanning tree mode
Spanning tree type
Spanning tree instance enabled
Designated Root
Designated Root Priority
Designated Root Cost
Designated Root Port
VLANs mapped:
Root Max Age
Bridge ID MAC ADDR
Bridge ID Priority
VLANs mapped:
Bridge Max Age 20 sec
OL-8978-04
Inst Port-State
1
forwarding
1
forwarding
1
forwarding
1
forwarding
1
forwarding
1
forwarding
1
forwarding
1
forwarding
1
blocking
1
forwarding
1
forwarding
1
blocking
1
blocking
1
forwarding
1
forwarding
MISTP
ieee
00-05-31-40-64-00
32769
(root priority:32768, sys ID ext:1)
20000
1/1
1,74
20 sec
Hello Time 2
00-d0-02-27-9c-00
32769
(bridge priority:32768, sys ID ext:1)
1,74
Hello Time 2
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring MISTP-PVST+ or MISTP on the Switch
Cost
Prio Portfast Channel_id
20000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
5000
32 disabled 833
20000
32 disabled 0
20000
32 disabled 0
200000
32 disabled 0
200000
32 disabled 0
20000
32 enabled
20000
32 enabled
Command
show spantree mistp-instance instance [mod/port]
active
sec
Forward Delay 15 sec
sec
Forward Delay 15 sec
0
0
7-39
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