debug spanning-tree

To enables the tracing of the STP module as per the configured debug levels, use the command debug spanning-tree in Privileged EXEC Mode. The trace statements are generated for the configured trace levels. This command allows combination of debug levels to be configured (that is, more than one level of trace can be enabled or disabled). The debug levels are configured one after the other and not in single execution of the command. The no form of this command disables the tracing of the STP module as per the configured debug levels. The trace statements are not generated for the configured trace levels.

debug spanning-tree

debug spanning-tree { {[all] } { [bpdu] } { [bridge-detection-state-machine] } { [errors] } { [events] } { [global] } { [init-shut] } { [management] } { [memory] } { [port-info-state-machine] } { [port-receive-state-machine] } { [port-role-selection-state-machine] } { [protocol-migration-state-machine] } { [pseudoInfo-state-machine] } { [redundancy] } { [role-transition-state-machine] } { [sem-variables] } { [state-transition-state-machine] } { [timer] } { [topology-change-state-machine]} } { [switch } { <default>] } { [{<level(0-7)> } { | alerts } { | critical } { | debugging } { | errors } { | informational } { | notification } { | warnings}] }

no debug spanning-tree

no debug spanning-tree { {[all] } { [bpdu] } { [bridge-detection-state-machine] } { [errors] } { [events] } { [global] } { [init-shut] } { [management] } { [memory] } { [port-info-state-machine] } { [port-receive-state-machine] } { [port-role-selection-state-machine] } { [protocol-migration-state-machine] } { [pseudoInfo-state-machine] } { [redundancy] } { [role-transition-state-machine] } { [sem-variables] } { [state-transition-state-machine] } { [timer] } { [topology-change-state-machine]} } { [switch } { <default>] } { | informational } { | notification } { | warnings}] } { | alerts }

Parameters

Parameter	Type	Description
`all`		Enter to generate debug statements for all RSTP / MSTP
`bpdu`		Enter to generate debug statements for BPDU-related traces.
`bridge-detection-state-machine`		Enter to generate debug statements for bridge detection SEM.
`errors`		Enter to generate debug statements for all failure traces.
`events`		Enter to generate debug statements for event handling traces. This trace is generated to denote events that are posted to STP configuration queue whenever you configure any of the STP features.
`global`		Enter to generate global debug messages.
`init-shut`		Enter to generate debug statements for init and shutdown traces. This trace is generated on failed and successful initialization and shutting down of STP related module and memory.
`management`		Enter to generate debug statements for management traces. This trace is generated whenever you configure any of the STP features.
`memory`		Enter to generate debug statements for memory related traces. This trace is generated on failed and successful allocation of memory for STP process.
`port-info-state-machine`		Enter to generate debug statements for port information SEM.
`port-receive-state-machine`		Enter to generate debug statements for port receive SEM.
`port-role-selection-state-machine`		Enter to generate debug statements for role selection SEM.
`port-transmit-state-machine`		Enter to generate debug statements for port transmit SEM
`protocol-migration-state-machine`		Enter to generate debug statements for protocol migration SEM.
`pseudoInfo-state-machine`		Enter to generate debug statements for port receive pseudo information SEM.
`redundancy`		Enter to generate debug statements for redundancy code flow traces. This trace is generated in standby node STP while taking backup of configuration information from active node.
`role-transition-state-machine`		Enter to generate debug statements for role transition SEM
`sem-variables`		Enter to generate debug statements for state machine variable changes traces. This trace is generated on failed and successful creation and deletion of semaphore.
`state-transition-state-machine`		Enter to generate debug statements for state transition SEM.
`timer`		Enter to generate debug statements for timer module traces. Tis generated on failed and successful start, stop and restart of STP timers.
`topology-change-state-machine`		Enter to generate debug statements for topology change SEM.
`switch`		Enter to generate debug statements for switch / context.
`default`		Enter to generate debug statements for the default for switch / context.
`<level (0-7)>`		Enter to generate debug statements for or the specified severity level value.This value ranges from 0 to 7.
`alerts`		Enter to generate debug statements for immediate action.
`critical`		Enter to generate debug statements for critical conditions.
`debugging`		Enter to generate debug statements for debugging messages.
`emergencies`		Enter to generate debug statements when system cannot be used.
`errors`		Enter to generate debug statements for for error conditions.
`informational`		Enter to generate debug statements for information messages.
`notification`		Enter to generate debug statements for significant messages.
`warnings`		Enter to generate debug statements for warning conditions.

Mode

Privileged EXEC Mode

Default

Tracing of the STP module is disabled.

Examples

iS5Comm# debug spanning-tree errors 1