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Chapter 8
Configuring Spanning Tree
This example shows how to configure BPDU skewing for VLAN 1 on module 8, port 2 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 displays if BPDU skew detection is enabled and also lists the
VLANs or instances 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
VLAN
----- -------- --------- -------- ---------- ----------
1
----- -------- --------- -------- ---------- ----------
Total
Console> (enable)
78-13315-02
Last Skew ms
Worst Skew ms
-------------
-------------
5869
Blocking Listening Learning Forwarding STP Active
6
4
Blocking Listening Learning Forwarding STP Active
6
4
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Worst Skew Time
-------------------------
108370
Tue Nov 21 2000, 06:25:59
2
0
2
0
12
Configuring BPDU Skewing
12
8-39
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Troubleshooting
