Debug Spanning-Tree - Cisco 4500M Command Reference Manual

debug spanning-tree

debug spanning-tree
To debug spanning tree activities, use the debug spanning-tree command. To disable debugging output,
use the no form of this command.
Syntax Description
all
bpdu
bpdu-opt
etherchannel
config
events
exceptions
general
mst
pvst+
root
snmp
Defaults
This command has no default settings.
Command Modes
Privileged EXEC
Command History Release
12.1(8a)EW
Examples
This example shows how to debug spanning tree PVST+:
Switch# debug spanning-tree pvst+
Spanning Tree PVST+ debugging is on
Switch#
Related Commands
undebug spanning-tree (same as no debug spanning-tree)
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
2-66
debug spanning-tree {all | bpdu | bpdu-opt | etherchannel | config | events | exceptions |
general | mst | pvst+ | root | snmp}
no debug spanning-tree {all | bpdu | bpdu-opt | etherchannel | config | events | exceptions |
general | mst | pvst+ | root | snmp}
Displays all spanning tree debugging messages.
Debugs spanning tree BPDU.
Debugs optimized BPDU handling.
Debugs spanning tree EtherChannel support.
Debugs spanning tree configuration changes.
Debugs TCAM events.
Debugs spanning tree exceptions.
Debugs general spanning tree activity.
Debugs multiple spanning tree events.
Debugs PVST+ events.
Debugs spanning tree root events.
Debugs spanning tree SNMP events.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
78-16201-01