Cisco WS-C3560E-48PD-SF Command Reference - Page 852

debug udld Appendix B Catalyst 3560 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 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. Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release 12.1(19)EA1 Modification This command was introduced. Usage Guidelines The undebug udld command is the same as the no debug udld command. 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 For debug udld registries, these categories of debugging messages appear: • Sub-block creation • Fiber-port status changes B-92 Catalyst 3560 Switch Command Reference 78-16405-05