This document defines a mechanism to run Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) interfaces. It does so by running an independent Asynchronous mode BFD session on every LAG member link. This mechanism allows the verification of member link continuity@ either in combination with@ or in absence of@ Link Aggregation Control Protocol (LACP). It provides a shorter detection time than what LACP offers. The continuity check can also cover elements of Layer 3 (L3) bidirectional forwarding.
RFC 7130-2014 history
2014RFC 7130-2014 Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces