Making Route Servers Aware of Data Link Failures at IXPs

The information below is for an old version of the document
Document Type Expired Internet-Draft (idr WG)
Authors Randy Bush  , Jeffrey Haas  , John Scudder  , Arnold Nipper  , Christoph Dietzel 
Last updated 2020-03-05 (latest revision 2019-09-02)
Replaces draft-ymbk-idr-rs-bfd
Stream Internet Engineering Task Force (IETF)
Expired & archived
pdf htmlized bibtex
Stream WG state Waiting for Implementation
Document shepherd Susan Hares
IESG IESG state Expired
Consensus Boilerplate Yes
Telechat date
Responsible AD (None)
Send notices to Susan Hares <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


When BGP route servers are used, the data plane is not congruent with the control plane. Therefore, peers at an Internet exchange can lose data connectivity without the control plane being aware of it, and packets are lost. This document proposes the use of a newly defined BGP Subsequent Address Family Identifier (SAFI) both to allow the route server to request its clients use BFD to track data plane connectivity to their peers' addresses, and for the clients to signal that connectivity state back to the route server.


Randy Bush (
Jeffrey Haas (
John Scudder (
Arnold Nipper (
Christoph Dietzel (

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