Unidirectional Link Detection: Difference between revisions

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For each device and for each port, a UDLD packet is sent to the port it links to. The packet contains sender identity information (device and port), and expected receiver identity information (device and port). Each port checks that the UDLD packets it receives contain the identifiers of his own device and port.
 
UDLD is a Cisco-proprietary protocol. Switches from [[3Com]] and its Enterprise division H3C have a similar feature called Device Link Detection Protocol (DLDP). 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 First Mile]] changes to [[802.3]] (previously [[802.3ah]]). Brocade devices also have support for UDLD.
D-Link has their DULD feature built on top of [[Ethernet]] [[OA&M|OAM]] function.
Brocade devices also have support for UDLD.
 
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