Best Practices for Advertisement of Multiple Paths in BGP

Document Type Replaced Internet-Draft (individual)
Authors Jim Uttaro  , Place Barbe  , Pierre Francois  , Roberto Fragassi  , Adam Simpson  , Prodosh Mohapatra 
Last updated 2011-01-10 (latest revision 2010-10-24)
Replaced by draft-ietf-idr-add-paths-guidelines
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Add-Paths is a BGP enhancement that allows a BGP router to advertise multiple distinct paths for the same prefix/NLRI. This provides a number of potential benefits, including reduced routing churn, faster convergence and better loadsharing. This document provides recommendations to implementers of Add-Paths so that network operators have the tools needed to address their specific applications and to manage the scalability impact of Add- Paths. A router implementing Add-Paths may learn many paths for a prefix and must decide which of these to advertise to peers. This document analyses different algorithms for making this selection and provides recommendations based on the target application.


Jim Uttaro (
Place Barbe (
Pierre Francois (
Roberto Fragassi (
Adam Simpson (
Prodosh Mohapatra (

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