Specifications

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Catalyst 4500 Se ries S wit ch C is co IO S C om mand R efer ence —Re lease I OS XE 3 .3.0 XO(1 5.1 (1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
debug spanning-tree
debug spa nning-tree
To debug the spanning tree a ctivities, use the debug spanning-tree command. To disable the debugging
output, use the no form of this command.
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | etherchannel | config | events |
exceptio ns | gene ral | ha | mstp | pvst+ | ro ot | snm p | switch | synchronization | uplinkfast}
no debug spanning-tree {all | bpdu | bpdu-opt | etherchannel | config | events | exceptions |
general | mst | pvst+ | root | snmp}
Syntax Description
Defaults This command has no default settings.
Command Modes Privileged EXEC mode
Examples This example shows how to debug the spanning-tr ee PVST+:
Switch# debug spanning-tree pvst+
Spanning Tree PVST+ debugging is on
Switch#
all Displays all the spanning tree debugging messages.
backbonefast Debugs the BackboneFast events.
bpdu Debugs the spanni ngtree BPDU.
bpdu-opt Debugs the optimized BPDU handling.
etherchannel Debugs the spanning tree E therChanne l suppor t.
config Debugs the span ning tre e confi guration c hanges.
events Debugs the TCAM events.
exceptio ns Debugs the spanning tree exceptions.
general Debugs the gener al spanning tree activity.
ha Debugs the HA events.
mstp Debugs the multiple spanning tree events.
pvst+ Debugs the PVST + events.
root Debugs the spanning tree root events.
snmp Debugs the spanning tree SNMP events.
switch Debugs the switch debug e vents.
synchronization De bugs the STP state synchroni zation events.
uplinkfast Debugs the UplinkF ast eve nts.