Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces

Document Type Replaced Internet-Draft (individual)
Last updated 2013-10-14 (latest revision 2013-04-12)
Replaced by draft-ietf-bfd-on-lags
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes a mechanism to run 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, LACP. It provides a shorter detection time than what LACP offers. The continuity check can also cover elements of layer 3 bidirectional forwarding. This mechanism utilizes a well-known UDP port distinct from that of single-hop BFD over IP. This new UDP port removes the ambiguity of BFD over LAG packets from BFD over single-hop IP.


Manav Bhatia (
Mach Chen (
Sami Boutros (
Marc Binderberger (
Jeffrey Haas (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)