Cisco WS-C4003 Software Guide - Page 131
Con BPDU skewing., You will receive a similar output when MISTP is running.
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Chapter 7 Configuring Spanning Tree Configuring Spanning Tree BPDU Skewing To configure the BPDU skewing statistics gathering for a VLAN, perform this task in privileged mode: Step 1 Step 2 Task Configure BPDU skewing. Verify the configuration. Command set spantree bpdu-skewing [enable | disable] show spantree bpdu-skewing vlan [mod/port] show spantree bpdu-skewing mistp-instance [instance] [mod/port] 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. 78-12647-02 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 7-35