Skip to main content

BGP Optimal Route Reflection (BGP-ORR)

Document Type Replaced Internet-Draft (individual)
Authors Robert Raszuk , Christian Cassar , Erik Aman , Bruno Decraene
Last updated 2011-03-12
Replaced by RFC 9107
Stream (None)
Intended RFC status (None)
Expired & archived
plain text htmlized pdfized bibtex
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-idr-bgp-optimal-route-reflection
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


[RFC4456] asserts that, because the Interior Gateway Protocol (IGP) cost to a given point in the network will vary across routers, "the route reflection approach may not yield the same route selection result as that of the full IBGP mesh approach." One practical implication of this assertion is that the deployment of route reflection may thwart the ability to achieve hot potato routing. Hot potato routing attempts to direct traffic to the closest AS egress point in cases where no higher priority policy dictates otherwise. As a consequence of the route reflection method, the choice of exit point for a route reflector and its clients will be the egress point closest to the route reflector - and not necessarily closest to the RR clients. Section 11 of [RFC4456] describes a deployment approach and a set of constraints which, if satsified, would result in the deployment of route reflection yielding the same results as the iBGP full mesh approach. Such a deployment approach would make route reflection compatible with the application of hot potato routing policy. As networks evolved to accommodate architectural requirements of new services, tunneled (LSP/IP tunneling) networks with centralized route reflectors became commonplace. This is one type of common deployment where it would be impractical to satisfy the constraints described in Section 11 of [RFC4456]. Yet, in such an environment, hot potato routing policy remains desirable. This document proposes two new solutions which can be deployed to facilitate the application of closest exit point policy centralized route reflection deployments.


Robert Raszuk
Christian Cassar
Erik Aman
Bruno Decraene

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