Debug Udld - Cisco Catalyst 3120 Command Reference Manual

Appendix B Cisco Catalyst Blade Switch 3120 for HP Debug Commands

debug udld

Use the debug udld privileged EXEC command to enable debugging of the UniDirectional Link
Detection (UDLD) feature. Use the no form of this command to disable UDLD debugging.
Syntax Description
events
packets
registries
Defaults Debugging is disabled.
Command Modes
Privileged EXEC
Command History Release
12.2(40)EX
Usage Guidelines
The undebug udld command is the same as the no debug udld command.
When you enable debugging, it is enabled only on the stack master. To enable debugging on a stack
member, you can start a session from the stack master by using the session switch-number privileged
EXEC command. Then enter the debug command at the command-line prompt of the stack member. You
also can use the remote command stack-member-number LINE privileged EXEC command on the stack
master switch to enable debugging on a member switch without first starting a session.
For debug udld events, these debugging messages appear:
•
•
•
•
•
•
OL-12248-01
debug udld {events | packets | registries}
no debug udld {events | packets | registries}
Display debug messages for UDLD process events as they occur.
Display debug messages for the UDLD process as it receives packets from the
packet queue and tries to send them at the request of the UDLD protocol code.
Display debug messages for the UDLD process as it processes registry calls from
the UDLD process-dependent module and other feature modules.
Modification
This command was introduced.
General UDLD program logic flow
State machine state changes
Program actions for the set and clear ErrDisable state
Neighbor cache additions and deletions
Processing of configuration commands
Processing of link-up and link-down indications
Cisco Catalyst Blade Switch 3120 for HP Command Reference
debug udld
B-87