Cisco WS-C3560E-48PD-SF Command Reference - Page 560

show udld Chapter 2 Catalyst 3560 Switch Cisco IOS Commands show udld Use the show udld user EXEC command to display UniDirectional Link Detection (UDLD) administrative and operational status for all ports or the specified port. show udld [interface-id] [ | {begin | exclude | include} expression] Syntax Description interface-id | begin | exclude | include expression (Optional) ID of the interface and port number. Valid interfaces include physical ports and VLANs. The VLAN range is 1 to 4094. (Optional) Display begins with the line that matches the expression. (Optional) Display excludes lines that match the expression. (Optional) Display includes lines that match the specified expression. Expression in the output to use as a reference point. Command Modes User EXEC Command History Release 12.1(19)EA1 Modification This command was introduced. Usage Guidelines If you do not enter an interface-id, administrative and operational UDLD status for all interfaces appear. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear. Examples This is an example of output from the show udld interface-id command. For this display, UDLD is enabled on both ends of the link, and UDLD detects that the link is bidirectional. Table 2-32 describes the fields in this display. Switch> show udld gigabitethernet0/1 Interface gi0/1 --Port enable administrative configuration setting: Follows device default Port enable operational state: Enabled Current bidirectional state: Bidirectional Current operational state: Advertisement - Single Neighbor detected Message interval: 60 Time out interval: 5 Entry 1 Expiration time: 146 Device ID: 1 Current neighbor state: Bidirectional Device name: Switch-A Port ID: Gi0/1 Neighbor echo 1 device: Switch-B Neighbor echo 1 port: Gi0/2 Message interval: 5 CDP Device name: Switch-A 2-528 Catalyst 3560 Switch Command Reference 78-16405-05