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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
show udld
show udld
Use the show udld user EXEC command to display UniDirectional Link Detection (UDLD) status for
all ports or the specified port.
show udld [interface-id] [ | {begin | exclude | include} expression]
Syntax Description
Command Modes User EXEC
Command History
Usage Guidelines If you do not enter an interface-id, the administrative and the 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 gigabitethernet0/1 command. In this example, UDLD
is enabled on both ends of the link, and UDLD detects that the link is bidirectional. Table 2-30 describes
the fields in this example.
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: 0050e2826000
Port ID: Gi0/2
Neighbor echo 1 device: SAD03160954
Neighbor echo 1 port: Gi0/1
interface-id (Optional) ID of the interface and port number. Valid interfaces include
physical ports and VLANs. The VLAN range is 1 to 4094.
| begin (Optional) Display begins with the line that matches the specified
expression.
| exclude (Optional) Display excludes lines that match the specified expression.
| include (Optional) Display includes lines that match the specified expression.
expression Expression in the output to use as a reference point.
Release Modification
12.0(5.2)WC(1) This command was introduced.
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