Unidirectional Link Detection: Difference between revisions

Revision as of 14:01, 6 November 2012

Revision as of 12:09, 14 February 2013

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{{Orphan|date=November 2006}}

{{unreferenced|date=January 2008}}

'''Unidirectional Link Detection''' ('''UDLD''') is a [[data link layer]] protocol from [[Cisco Systems]] to monitor the physical configuration of the cables and detect unidirectional links. UDLD complements the [[Spanning Tree Protocol]] which is used to eliminate [[switching loop]]s.

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The need for UDLD has been eliminated when operating over 10GbE, as per 802.3ae/D3.2, when a fault is detected in the physical link:

* The local device signals local fault is signaled by PHY

* The local device ceases transmission of MAC frames and transmits remote fault

* The remote device receives remote fault and stops sending frames and continuously generates idle frames

== External links ==

* [http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a008009477b.shtml Understanding and Configuring the Unidirectional Link Detection Protocol Feature] at [[Cisco Systems]]

* [https://www.iol.unh.edu/services/testing/10gec/training/10GbE_fault_signaling.pdf 10Gig Link Fault Signaling Updated to IEEE Draft P802.3ae/D3.2]

* [https://www.iol.unh.edu/services/testing/10gec/training/10GbE_fault_signaling.pdf 10Gig Link Fault Signaling Updated to IEEE Draft P802.3ae/D3.2]

[[Category:Link protocols]]

[[Category:Cisco protocols]]

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