Reference Guide

848 UDLD Commands
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\CLI Folders\Dell Plasma-ARC
2+3\new_system_mifs_ARC3_latest\UDLD.fm
DELL CONFIDENTIAL – PRELIMINARY 5/21/14 - FOR PROOF ONLY
User Guidelines
This command affects fiber interfaces only. Use the udld port command in
Interface Configuration mode to enable UDLD on other interface types.
Use the no form of this command to disable UDLD on all fiber ports.
The device supports the UDLD protocol specified by RFC 5171.
UDLD supports two modes of operation: normal and aggressive. In the
aggressive mode the device shuts down a port if it cannot explicitly detect
that the link is bidirectional. In the normal mode the device shuts down an
interface if it explicitly detect that the link is unidirectional. A unidirectional
link occurs whenever traffic sent by a local device is received by its neighbor
but traffic from the neighbor is not received by the local device.
You can use the set interface active command to reset an interface shut
down by UDLD.
Example
This example shows how to enable UDLD on all fiber interfaces:
console(config)# udld normal
udld message timeout
Use the udld message time command in Global Configuration mode to
configure a global value of the interval between two sent probe messages. To
return to the default value, use the no form of this command.
Syntax
udld message timeout seconds
no udld message time
Parameters
seconds —Interval between two sent probe messages. The valid values are
from 1 to 90 seconds.
Default Configuration
15 seconds.