Debug Spanning-Tree - Cisco Catalyst 2950 Command Reference Manual

debug spanning-tree

debug spanning-tree
Use the debug spanning-tree privileged EXEC command to enable debugging of spanning-tree
activities. Use the no form of this command to disable debugging.
The csuf option is not supported on the switch.
Note
Syntax Description all
backbonefast
bpdu
bpdu-opt
config
csuf/csrt
etherchannel
events
exceptions
general
mstp
pvst+
root
snmp
switch
synchronization
uplinkfast
Defaults
Debugging is disabled.
Command Modes Privileged EXEC
Catalyst 2950 and Catalyst 2955 Switch Command Reference
C-10
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel |
events | exceptions | general | mstp | pvst+ | root | snmp | switch | synchronization |
uplinkfast}
no debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel
| events | exceptions | general | mstp | pvst+ | root | snmp | switch | synchronization |
uplinkfast}
Display all spanning-tree debug messages.
Display BackboneFast-event debug messages.
Display spanning-tree bridge protocol data unit (BPDU) debug messages.
Display optimized BPDU handling debug messages.
Display spanning-tree configuration change debug messages.
Display cross-stack UplinkFast activity debug messages.
Display EtherChannel-support debug messages.
Display spanning-tree topology event debug messages.
Display spanning-tree exception debug messages.
Display general spanning-tree activity debug messages.
Debug Multiple Spanning Tree Protocol events.
Display per-VLAN spanning-tree plus (PVST+) event debug messages.
Display spanning-tree root-event debug messages.
Display spanning-tree Simple Network Management Protocol (SNMP)
handling debug messages.
Display switch shim command debug messages. This shim is the software
module that is the interface between the generic Spanning Tree Protocol (STP)
code and the platform-specific code of various switch platforms.
Display the spanning-tree synchronization event debug messages.
Display UplinkFast-event debug messages.
Appendix C Catalyst 2950 and 2955 Switch Debug Commands
OL-10102-01