C-28
Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Appendix C Catalyst 2950 and 2955 Switch Debug Commands
debug udld
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 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
For debug udld packets, these debugging messages appear:
• General packet processing program flow on receipt of an incoming packet
• Indications of the contents of the various pieces of packets received (such as type length versions
[TLVs]) as they are examined by the packet reception code
• Packet transmission attempts and the outcome
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
12.1(6)EA2 This command was introduced.
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