This video provides an overview of the far-end failure detection, referred to as FEFD. It covers what FEFD is, how it works, and how it helps to detect failures. FEFD is a protocol that detects remote data link errors in a network. FEFD uses a link layer echo protocol to detect and signal far-end failures over Ethernet and optical links. When you enable FEFD, switches periodically exchange FEFD echo frames to identify link failures.
If the local switch does not receive an echo from its peer for the time interval of three times the configured FEFD message interval, the local switch assumes that the peer link is down. The default FEFD message interval is 15 seconds. For example, with the default configuration, if the local switch does not receive an echo message for 45 seconds from its peer, it reflects that the peer link is down.
FEFD helps to detect far-end failure when only one side receives packets, although the physical layer, or L1, of the link is up on both sides or transceivers are not connected to the correct ports. For more information refer to the Dell EMC SmartFabric OS10 User Guide at Dell.com/Support.
