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CCIE #29033
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What does UDLD stand for and when would you use it?
1 comments:
UDLD (UniDirectional Link Detection) - is a layer 2 protocol that is used to detect the status of a layer 1 physical link. It identifies when data is set to a neighbor but the neighbor is not able to transmit back to the sending
device.
Example: |SW1| -----Link---- |SW2| SW1 transmits the data to SW2 through its Tx wire and SW2 cannot receive the data on its Rx wire (physical issue). Note: SW2 Tx wire is fine. UDLD must be enabled on both sides of the link to detect the issue identified above. UDLD sends packets to the neighbor and expects an echo back, if no echo is received UDLD disables the port.
Global Config
"udld enable" - this is only used on fiber links
Interface Config
"udld enable" - this can be used for copper and for fiber links (with fiber links this setting overrides the global config setting)
"show udld interface (interface)"
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