Cisco WS-C6506 Software Manual page 197

Chapter 7 Configuring Spanning Tree
Console> (enable) show spantree mst 3
Spanning tree mode
Instance
VLANs Mapped:
Designated Root
Designated Root Priority
Designated Root Cost
Designated Root Port
Bridge ID MAC ADDR
Bridge ID Priority
Port
------------------------ ------------- ---- --------- ---- --------------------
6/1
6/2
Configuring the MST Port Cost
You can configure the port cost of the switch ports. The ports with the lower port costs are more likely
to be chosen to forward frames. Assign the lower numbers to the ports that are attached to faster media
(such as full duplex) and higher numbers to the 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 the path cost, see the
To configure the port cost for a port, perform this task in privileged mode:
Task
Step 1 Configure the MST port cost for a switch port.
Step 2 Verify the port cost setting.
This example shows how to configure the port cost on an MST instance and verify the configuration:
Console> (enable) set spantree portcost 6/1 10000 mst
Spantree port 6/1 path cost set to 10000.
Console> (enable)
Console> (enable) show spantree mst 6/1
Edge Port:
Link Type:
Port Guard:
Boundary:
Inst State
---- ------------- ---- --------- ---------------------------------------
Console> (enable)
OL-8978-04
State
No, (Configured) Default
P2P, (Configured) Auto
Default
Yes (PVST)
Role Cost
0 forwarding ROOT
1 forwarding MSTR
2 forwarding MSTR
3 forwarding MSTR
4 forwarding MSTR
MST
3
31-40
00-00-00-00-00-00
0 (root priority: 0, sys ID ext: 0)
0 Remaining Hops 0
1/0
00-d0-00-4c-18-00
8195 (bridge priority: 8192, sys ID ext: 3)
Role Cost
forwarding MSTR 2000
blocking MSTR 2000
"Calculating and Assigning Port Costs" section on page
Command
set spantree portcost mod/port cost [mst]
show spantree mst [instance | mod/port]
Prio VLANs
10000 32 1
10000 32 2-20
10000 32 21-30
10000 32 31-40
10000 32 41-50
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring Multiple Spanning Tree on the Switch
Prio Type
32 P2P, Boundary (PVST)
32 P2P, Boundary (PVST)
7-4.
7-55