Table of Contents
Using MISTP-PVST+ or MISTP
This example shows how to display the spanning tree VLAN instance mapping in MISTP mode:
Console> (enable) set spantree mode mistp
PVST+ database cleaned up.
Spantree mode set to MISTP.
Console> (enable) show spantree mapping
Inst Root Mac
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Configuring the MISTP Bridge ID Priority
You can set the bridge ID priority for an MISTP instance when the switch is in MISTP or MISTP-PVST+
mode.
The switch combines the bridge priority value with the system ID extension (the ID of the MISTP
instance) to create the bridge ID priority. You can set 16 possible bridge priority values: 0, 4096, 8192,
12,288, 16,384, 20,480, 24,576, 28,672, 32,768, 36,864, 40,960, 45,056, 49,152, 53,248, 57,344, and
61,440.
To configure the bridge ID priority for an MISTP instance, perform this task in privileged mode:
Task
Step 1
Configure the bridge ID priority for an
MISTP instance.
Step 2
Verify the bridge ID priority.
The example shows how to configure the bridge ID priority for an MISTP instance:
Console> (enable) set spantree priority 32768 mistp-instance 1
Spantree 1 bridge ID priority set to 32769
(bridge priority: 32768 + sys ID extension: 1)
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:
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
7-32
Vlans
00-50-3e-78-70-00 1
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Command
set spantree priority bridge_ID_priority [mistp-instance
instance]
show spantree mistp-instance instance [mod/port] active
MISTP
ieee
00-05-31-40-64-00
32769
(root priority:32768, sys ID ext:1)
20000
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Chapter 7
Configuring Spanning Tree
—
Release 8.1
78-15486-01
- Quick Links:
- Configuration Guide
- Catalyst 2980G Switch
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