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B-105

Catalyst 3750-X and 3560-X Switch Command Reference

OL-29704-01

Appendix B Catalyst 3750-X and 3560-X Switch 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.

debug udld {events | packets | registries}

no debug udld {events | packets | registries}

Syntax Description

Defaults Debugging is disabled.

Command Modes Privileged EXEC

Command History

Usage Guidelines The undebug udld command is the same as the no debug udld command.

When you enable debugging on a switch stack, 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:

• 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

events Display debug messages for UDLD process events as they occur.

packets 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.

registries Display debug messages for the UDLD process as it processes registry calls from

the UDLD process-dependent module and other feature modules.

Release Modification

12.2(53)SE2 This command was introduced.

Cisco Catalyst 3750-X Command Reference

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