Cisco Catalyst 2950 Command Reference Manual page 396

debug udld
For debug udld registries, these categories of debugging messages appear:
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Related Commands Command
show debugging
show udld
Catalyst 2950 Desktop Switch Command Reference
A-24
Sub-block creation
Fiber-port status changes
State change indications from the port manager software
MAC address registry calls
Description
Displays information about the types of debugging that are enabled. For
syntax information, refer to Cisco IOS Configuration Fundamentals
Command Reference For IOS Release 12.1 > Cisco IOS System
Management Commands > Troubleshooting Commands.
Displays UDLD administrative and operational status for all ports or the
specified port.
Appendix A Debug Commands
78-11381-05