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Configuring BPDU Skewing on the Switch
Task
Step 1
Configure BPDU skewing.
Step 2
Verify the configuration.
This example shows how to configure BPDU skewing and display the skewing statistics:
Console> (enable) set spantree bpdu-skewing
Usage:set spantree bpdu-skewing <enable|disable>
Console> (enable) set spantree bpdu-skewing enable
Spantree bpdu-skewing enabled on this switch.
Console> (enable)
Console> (enable) show spantree bpdu-skewing 1
Bpdu skewing statistics for vlan 1
Port
------
8/2
8/4
8/6
8/8
8/10
8/12
8/14
8/16
8/18
8/20
8/22
8/24
8/26
8/28
Console> (enable)
This example shows how to configure BPDU skewing for VLAN 1 on module 8, port 2 and display the
skewing statistics:
Console> (enable) show spantree bpdu-skewing 1 8/4
Bpdu skewing statistics for vlan 1
Port
------
8/4
You will receive a similar output when MISTP is running.
The show spantree summary command displays if BPDU skew detection is enabled and also lists the
VLANs or instances that are affected in the skew. This example shows the output when using the show
spantree summary command:
Console> (enable) show spantree summary
Root switch for vlans: 1
BPDU skewing detection enabled for the bridge
BPDU skewed for vlans: 1
Portfast bpdu-guard disabled for bridge.
Portfast bpdu-filter disabled for bridge.
Uplinkfast disabled for bridge.
Backbonefast disabled for bridge.
Summary of connected spanning tree ports by vlan
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
7-60
Last Skew ms
Worst Skew ms
-------------
-------------
5869
4050
113363
4111
113522
4111
113678
4111
113833
4111
113917
4110
113926
4111
Last Skew ms
Worst Skew ms
-------------
-------------
5869
Command
set spantree bpdu-skewing [enable | disable]
show spantree bpdu-skewing vlan [mod/port]
show spantree bpdu-skewing mistp-instance
[instance] [mod/port]
Worst Skew Time
-------------------------
108370
Tue Nov 21 2000, 06:25:59
113198
Tue Nov 21 2000, 06:26:04
113363
Tue Nov 21 2000, 06:26:05
113441
Tue Nov 21 2000, 06:26:05
113522
Tue Nov 21 2000, 06:26:05
113600
Tue Nov 21 2000, 06:26:05
113678
Tue Nov 21 2000, 06:26:05
113755
Tue Nov 21 2000, 06:26:05
113833
Tue Nov 21 2000, 06:26:05
113913
Tue Nov 21 2000, 06:26:05
113917
Tue Nov 21 2000, 06:26:05
113922
Tue Nov 21 2000, 06:26:05
113926
Tue Nov 21 2000, 06:26:05
113931
Tue Nov 21 2000, 06:26:05
Worst Skew Time
-------------------------
108370
Tue Nov 21 2000, 06:25:59
Chapter 7
Configuring Spanning Tree
OL-8978-04
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