Best Practices for Advertisement of Multiple Paths in IBGP

Document Type Expired Internet-Draft (idr WG)
Last updated 2015-10-14 (latest revision 2014-12-04)
Replaces draft-uttaro-idr-add-paths-guidelines
Stream IETF
Intended RFC status Proposed Standard
Expired & archived
plain text pdf html
Stream WG state WG Consensus: Waiting for Write-Up Jun 2015
Revised I-D Needed - Issue raised by WGLC, Doc Shepherd Follow-up Underway
Document shepherd Susan Hares
IESG IESG state Expired
Telechat date
Responsible AD (None)
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This Internet-Draft is no longer active.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 (
P. Francois (
Keyur Patel (
Prodosh Mohapatra (
Jeffrey Haas (
Adam Simpson (
Roberto Fragassi (

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