Nov 29, 2010 - 
Blueprint (CCIE R&S), Certification 
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Blueprint (CCIE R&S), Certification No Comments UDLD
Unidirectional Link Detection (UDLD) is a Cisco proprietary extension that lives to detect miss-configured and broken links between Cisco switches. It verifies that they can both send and receive data on a point-to-point link. This can be used to assist spanning-tree and compliments things like ‘loop guard’ and ‘bridge assurance’ in your spanning-tree designs. Read more »