Debug Spanning-Tree - Cisco Catalyst 2960-X Command Reference Manual

debug spanning-tree

debug spanning-tree
To enable debugging of spanning-tree activities, use the debug spanning-tree command in EXEC mode. To
disable debugging, use the no form of this command.
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel | events |
exceptions | general | mstp | pvst+| root | snmp | synchronization | switch | uplinkfast}
no debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel | events
| exceptions | general | mstp | pvst+| root | snmp | synchronization | switch | uplinkfast}
Syntax Description
all
backbonefast
bpdu
bpdu-opt
config
csuf/csrt
etherchannel
events
exceptions
general
mstp
pvst+
root
snmp
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
38
Displays all spanning-tree debug messages.
Displays BackboneFast-event debug messages.
Displays spanning-tree bridge protocol data unit
(BPDU) debug messages.
Displays optimized BPDU handling debug messages.
Displays spanning-tree configuration change debug
messages.
Displays cross-stack UplinkFast and cross-stack rapid
transition activity debug messages.
Displays EtherChannel-support debug messages.
Displays spanning-tree topology event debug messages.
Displays spanning-tree exception debug messages.
Displays general spanning-tree activity debug messages.
Debugs Multiple Spanning Tree Protocol (MSTP)
events.
Displays per-VLAN spanning-tree plus (PVST+) event
debug messages.
Displays spanning-tree root-event debug messages.
Displays spanning-tree Simple Network Management
Protocol (SNMP) handling debug messages.
Layer 2 Commands
OL-29043 -01