Show Udld - Cisco Catalyst 2950 Command Reference Manual

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

show udld

Use the show udld user EXEC command to display UniDirectional Link Detection (UDLD) status for
all ports or the specified port.
Syntax Description interface-id
| begin
| exclude
| include
expression
Command Modes User EXEC
Command History Release
12.0(5.2)WC(1)
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.
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
0L-10102-01
show udld [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 specified
expression.
(Optional) Display excludes lines that match the specified expression.
(Optional) Display includes lines that match the specified expression.
Expression in the output to use as a reference point.
Modification
This command was introduced.
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
Catalyst 2950 and Catalyst 2955 Switch Command Reference
show udld
Table 2-30 describes
2-411