Cisco WS-C2960-24TC-L Software Guide - Page 154
skewing statistics, You will receive a similar output when MISTP is running.
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Configuring Spanning Tree BPDU Skewing Chapter 7 Configuring Spanning Tree 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 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 Last Skew ms Worst Skew ms Worst Skew Time 8/2 5869 108370 Tue Nov 21 2000, 06:25:59 8/4 4050 113198 Tue Nov 21 2000, 06:26:04 8/6 113363 113363 Tue Nov 21 2000, 06:26:05 8/8 4111 113441 Tue Nov 21 2000, 06:26:05 8/10 113522 113522 Tue Nov 21 2000, 06:26:05 8/12 4111 113600 Tue Nov 21 2000, 06:26:05 8/14 113678 113678 Tue Nov 21 2000, 06:26:05 8/16 4111 113755 Tue Nov 21 2000, 06:26:05 8/18 113833 113833 Tue Nov 21 2000, 06:26:05 8/20 4111 113913 Tue Nov 21 2000, 06:26:05 8/22 113917 113917 Tue Nov 21 2000, 06:26:05 8/24 4110 113922 Tue Nov 21 2000, 06:26:05 8/26 113926 113926 Tue Nov 21 2000, 06:26:05 8/28 4111 113931 Tue Nov 21 2000, 06:26:05 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 Last Skew ms Worst Skew ms Worst Skew Time 8/4 5869 108370 Tue Nov 21 2000, 06:25:59 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 Blocking Listening Learning Forwarding STP Active 1 6 4 2 0 12 7-58 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01
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