Cisco WS-C2950SX-48-SI Configuration Manual page 154

Configuring Spanning Tree BPDU Skewing
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
8/28
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.
Portfast bpdu-filter disabled for bridge.
Uplinkfast disabled for bridge.
Backbonefast disabled for bridge.
Summary of connected spanning tree ports by vlan
VLAN
----- -------- --------- -------- ---------- ----------
1
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
7-58
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
Blocking Listening Learning Forwarding STP Active
6 4
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
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Chapter 7 Configuring Spanning Tree
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Release 8.1
78-15486-01