Unidirectional Link Detection: Difference between revisions

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UDLD is a Cisco-proprietary protocol but HP, [[Extreme Networks]], and [[Avaya|AVAYA]] all have a similar feature calling it by a different name. HP calls theirs Device Link Detection Protocol (DLDP). Extreme Networks call it Extreme Link Status Monitoring (ELSM) and AVAYA calls theirs, Link-state Tracking. [[Brocade_Communications_Systems|Brocade]]/[[Ruckus Networks]] ICX Switches offer this feature as Uni-Directional Link Detection(UDLD).
 
Similar functionality in a standardized form is provided as part of the [[Ethernet]] [[OA&M|OAM]] protocol that is defined as part of the [[Ethernet in the Firstfirst Milemile]] changes to [[802.3]] (previously [[802.3ah]]). [[D-Link]] has their DULD feature built on top of [[Ethernet]] [[OA&M|OAM]] function. [[Brocade Communications Systems|Brocade]] devices running Ironware support a proprietary form of UDLD.
 
The use of UDLD over 10GbE is augmented, as per 802.3ae/D3.2 standard, when a fault is detected in the physical link: