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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro 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 interfaces or the specified interface.
show udld [interface-id]
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 are
displayed.
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 2-30 describes
the fields in this display.
Switch> show udld fastethernet1/0/11
Interface fa1/0/11
---
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: Fa1/0/12
Neighbor echo 1 device: Switch-B
Neighbor echo 1 port: Fa1/0/11
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.
Release Modification
12.1(14)AX This command was introduced.
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