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Catalyst 3560 Switch Command Reference
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands
show udld
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
Command Modes User EXEC
Command History
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
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 expression.
| exclude (Optional) Display excludes lines that match the expression.
| include (Optional) Display includes lines that match the specified expression.
expression Expression in the output to use as a reference point.
Release Modification
12.1(19)EA1 This command was introduced.
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