Debug Udld - Cisco Catalyst 2960 Command Reference Manual

Appendix B Catalyst 2960 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.
Syntax Description events
packets
registries
Defaults Debugging is disabled.
Command Modes Privileged EXEC
Command History Release
12.2(25)FX
Usage Guidelines The undebug udld command is the same as the no debug udld command.
For debug udld events, these debugging messages appear:
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For debug udld packets, these debugging messages appear:
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For debug udld registries, these categories of debugging messages appear:
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OL-8604-03
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
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
Sub-block creation
Fiber-port status changes
Catalyst 2960 Switch Command Reference
debug udld
B-81