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Community Member

UDLD in cisco router

Hi all,

Do we have udld support in routers ? can someone pls guide me if we have this feature available on cisco routers ?                   

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UDLD in cisco router

Do we have udld support in routers ? can someone pls guide me if we have this feature available on cisco routers ?

I don't think UDLD is supported in routers.

Community Member

UDLD in cisco router

UDLD is used to prevent STP loops, therefore it L2 protocol and it does not run on the L3 interfaces. If you have router with a switch ports on the router, then you might have it

UDLD in cisco router

UDLD is a Layer 2 protocol that enables devices connected through fiber-optic or twisted-pair Ethernet cables to monitor the physical configuration of the cables and detect when a unidirectional link exists. It is not used to prevent STP loops. It is supported on some of the etherswitch daughter cards. I don't have any fiber terminating on the chassis SFP ports so I'm not sure if it's supported there.

Community Member

UDLD in cisco router

This document explains how the Unidirectional Link Detection (UDLD) protocol can help to prevent forwarding loops and blackholing of traffic in switched networks.

Cisco

Regards,

Cisco Employee

UDLD in cisco router

Hi Jonn,

Just to give some more information about UDLD, whenever the switch detects a unidirectional link in the layer 2 LAN switching environment, it prefers to block the port completly(send it to err-disabled) rather than allowing the unidirectional flow of information. It has no use in the layer 3 environment.

Thanks.

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