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Configuring MISTP-PVST+ or MISTP on the Switch
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 Cost
You can configure the port cost of switch ports. The ports with lower port costs are more likely to be
chosen to forward frames. Assign lower numbers to ports that are attached to faster media (such as full
duplex) and higher numbers to ports that are attached to slower media. The possible range of cost is from
1–65535 when using the short method for calculating port cost and from 1–200000000 when using the
long method. The default cost differs for different media. For information about calculating path cost,
see the
To configure the port cost for a port, perform this task in privileged mode:
Task
Step 1
Configure the MISTP port cost for a switch port. set spantree portcost mod/port cost
Step 2
Verify the port cost setting.
This example shows how to configure the port cost on an MISTP instance and verify the configuration:
Console> (enable) set spantree portcost 1/1 20000
Spantree port 1/1 path cost set to 20000.
Console> (enable) show spantree mistp-instance 1 active
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
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
7-38
Inst Port-State
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
"Calculating and Assigning Port Costs" section on page
MISTP
ieee
00-05-31-40-64-00
32769
20000
1/1
1,74
20 sec
Hello Time 2
00-d0-02-27-9c-00
32769
1,74
Hello Time 2
Cost
forwarding
20000
forwarding
200000
forwarding
200000
forwarding
200000
forwarding
200000
forwarding
200000
forwarding
200000
forwarding
200000
blocking
5000
forwarding
20000
forwarding
20000
blocking
200000
blocking
200000
forwarding
20000
forwarding
20000
Command
show spantree mistp-instance instance
[mod/port] active
(root priority:32768, sys ID ext:1)
sec
Forward Delay 15 sec
(bridge priority:32768, sys ID ext:1)
sec
Forward Delay 15 sec
Chapter 7
Configuring Spanning Tree
Prio Portfast Channel_id
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 833
32 disabled 0
32 disabled 0
32 disabled 0
32 disabled 0
32 enabled
0
32 enabled
0
7-4.
OL-8978-04
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