This chapter describes the Unidirectional Link Detection (UDLD) chapter, which covers UDLD operation, types of fault detection, modes of operation, aging mechanism, state machines, and limitations, and includes the task to configure UDLD on an Ethernet interface on the router.
Unidirectional Link Detection protocol
This topic describes Unidirectional Link Detection (UDLD), a Cisco-proprietary single-hop physical link protocol that monitors ethernet links, including point-to-point and shared media links, and detects link error conditions such as miswiring or unidirectional link failure that are not detected at the physical link layer.
Configure UDLD
This topic describes how to configure the Unidirectional Link Detection (UDLD) protocol on a physical ethernet interface, and optionally set the mode of operation, message time, and syslog message suppression for the interface.