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UDLD (Unidirectional Link Detection) using for detecting optical fiber unidirectional link. It supports two modes of operation: normal mode(the default) and aggressive mode. In normal mode, UDLD can detect unidirectional links due to mis-connected interfaces. In aggressive mode, UDLD can also detect unidirectional links due to one-way traffic, twisted-pair links, and mis-connected interfaces. You can enable UDLD globally or on specific ports. When UDLD detectes uni-directional fault, the port status will be setted Disabled(UDLD) and down, and there is no udld neighbor. In addition, UDLD can detect the self loop port and disable this port. Self loop means TX links to RX on the same port. 

Info
titleNOTE:
  • The hostname (set system hostname) of the devices at both ends of the UDLD cannot be the same. If they are the same, UDLD considers that there is a loop. The For the case of TX-RX (RX indicates the receiving end, and TX indicates the sending end) self-loops on one ethernet port, the port status will be set to Disabled (UDLD) and down, and there will be no UDLD neighbor.
  • Caution: Do not configure up-mode with UDLD, as this may cause the peer interface to be disabled unexpectedly by UDLD.

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