Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 139

Chapter 8 Configuring Spanning Tree
This example shows how to configure the port priority and verify the configuration:
Console> (enable) set spantree portpri 2/12 40
Bridge port 2/12 port priority set to 40.
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
Port
------------------------ ---- ------------- --------- ---- -------- ----------
2/12
Console> (enable)
Configuring the MISTP Port Instance Cost
You can configure the port instance cost for an instance of MISTP or MISTP-PVST+. Ports with a lower
instance cost are more likely to be chosen to forward frames. You should assign lower numbers to ports
attached to faster media (such as full duplex) and higher numbers to ports attached to slower media. The
default cost differs for different media. The possible value for port instance cost is 1–268435456.
To configure the port instance cost for a port, perform this task in privileged mode:
Task
Configure the MISTP port instance cost on
a port.
This example shows how to configure the MISTP port instance cost on a port:
Console> (enable) set spantree portinstancecost 2/12 cost 110110 2
Port 2/12 instances 1,3-16 have path cost 22222222.
Port 2/12 instances 2 have path cost 110110.
Console> (enable)
Configuring the MISTP Port Instance Priority
You can set the port priority for an instance of MISTP. The port with the lowest priority value for a
specific MISTP instance forwards frames for that instance. The possible port instance range is 0–63. If
all ports have the same priority value for an MISTP instance, the port with the lowest port number
forwards frames for that instance.
78-13315-02
MISTP-PVST+
ieee
00-d0-00-4c-18-00
32769 (root priority: 32768, sys ID ext: 1)
0
none
6
20 sec Hello Time 2 sec
00-d0-00-4c-18-00
32769 (bridge priority: 32768, sys ID ext: 1)
6
Hello Time 2 sec
Inst Port-State
1 forwarding
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Forward Delay 15 sec
Forward Delay 15 sec
Cost Prio Portfast Channel_id
22222222 40 disabled 0
Command
set spantree portinstancecost {mod/port} [cost cost]
[instances]
Using MISTP-PVST+ or MISTP
8-27