Alcatel-Lucent 7750 SR Manual page 1724

Show, Clear, Debug Commands
all-events
Syntax all-events
Context debug>service>id>stp
Description This command enables STP debugging for all events.
bpdu
Syntax [no] bpdu
Context debug>service>id>stp
Description
This command enables STP debugging for received and transmitted BPDUs.
core-connectivity
Syntax [no] core-connectivity
Context debug>service>id>stp
Description This command enables STP debugging for core connectivity.
exception
Syntax [no] exception
Context debug>service>id>stp
Description
This command enables STP debugging for exceptions.
fsm-state-changes
Syntax [no] fsm-state-changes
Context debug>service>id>stp
Description This command enables STP debugging for FSM state changes.
Page 1724 7750 SR OS Services Guide