Cisco WS-C4003 - Catalyst 4000 Chassis Switch Software Configuration Manual page 131

Chapter 7 Configuring Spanning Tree
To configure the BPDU skewing statistics gathering for a VLAN, perform this task in privileged mode:
Task
Step 1
Configure BPDU skewing.
Step 2
Verify the configuration.
This example shows how to configure BPDU skewing and view the skewing statistics:
Console> (debug-eng) set spantree bpdu-skewing
Usage:set spantree bpdu-skewing <enable|disable>
Console> (debug-eng)
Console> (debug-eng)
Console> (debug-eng) set spantree bpdu-skewing enable
Spantree bpdu-skewing enabled on this switch.
Console> (debug-eng)
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
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Console> (enable)
This example shows how to configure BPDU skewing for VLAN 1 on module 8, port 4 and view 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 shows if BPDU skew detection is enabled and also lists the
VLANs or instances affected in the skew. This example shows the output of 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.
78-12647-02
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
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
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
Configuring Spanning Tree BPDU Skewing
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