Customized BGP Route Selection Using BGP/MPLS VPNs

Thu, 10/15/2009 - 14:56 by Laurent Vanbever


A large ISP typically learns many routes to remote destinations, and these routes differ in terms of their performance, cost, stability, and security properties. An ISP's customers may also have different preferences for the paths that would carry their traffic. For example, financial institutions may prefer the most secure paths (e.g., paths that circumvent untrusted ASes, such as ASes known to censor traffic), while providers of interactive applications like online gaming and VoIP may prefer short paths with low latency. If such options were available, customers might be willing to pay a higher price to have the paths they want. Yet some other customers may be perfectly happy with whatever path the ISP provides for a relatively low price.

Yet, today's BGP requires each router to select a single best route, making it difficult for an ISP to select different routes for different customers. In this talk, we describe how an ISP can offer customized route selection using existing router mechanisms. Such a service requires to disseminate multiple BGP routes within the AS, perform customized route selection at each AS border router, and direct data traffic on the chosen interdomain paths.

As a proof of concept, we present a configuration supporting customized BGP route selection based on the BGP/MPLS VPN machinery. We evaluate the overhead of our solution, and discuss how new BGP/MPLS VPN router features and protocol enhancements could improve its scalability.

Laurent Vanbever, Pierre Francois, Olivier Bonaventure and Jennifer Rexford
Routing Symposium, Cisco Systems, San Jose, CA, USA, October 5, 2009.
pdf    (249.16 KB)
Cite it
See here

IEEE Copyright Notice: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

ACM Copyright Notice: Copyright 1999 by the Association for Computing Machinery, Inc. Permission to make digital or hard copies of part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page or intial screen of the document. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Publications Dept., ACM Inc., fax +1 (212) 869-0481, or

Springer-Verlag LNCS Copyright Notice: The copyright of these contributions has been transferred to Springer-Verlag Berlin Heidelberg New York. The copyright transfer covers the exclusive right to reproduce and distribute the contribution, including reprints, translations, photographic reproductions, microform, electronic form (offline, online), or any other reproductions of similar nature. Online available from Springer-Verlag LNCS series.


Cisco_NAG_2009_ns_bgp.pdf 249.16 KB