Alcatel-Lucent 7750 SR OS Service Manual page 1218

VPRN Service Configuration Commands
The no form of the command disables debugging.
bpdu
Syntax [no] bpdu
Context debug>service>stp
Description
This command enables STP debugging for received and transmitted BPDUs.
The no form of the command disables debugging.
core-connectivity
Syntax [no] core-connectivity
Context debug>service>stp
Description
This command enables STP debugging for core connectivity.
The no form of the command disables debugging.
exception
Syntax [no] exception
Context debug>service>stp
Description
This command enables STP debugging for exceptions.
The no form of the command disables debugging.
fsm-state-changes
Syntax [no] fsm-state-changes
Context debug>service>stp
Description
This command enables STP debugging for FSM state changes.
The no form of the command disables debugging.
fsm-timers
Syntax [no] fsm-timers
Context debug>service>stp
Description
This command enables STP debugging for FSM timer changes.
Page 1218 7750 SR OS Services Guide