Cart (Loading....) | Create Account
Close category search window
 

Wheel + Ring = Reel: The Impact of Route Filtering on the Stability of Policy Routing

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Cittadini, L. ; Dept. of Comput. Sci. & Autom., Roma Tre Univ., Rome, Italy ; Di Battista, G. ; Rimondini, M. ; Vissicchio, S.

Border Gateway Protocol (BGP) allows providers to express complex routing policies preserving high degrees of autonomy. However, unrestricted routing policies can adversely impact routing stability. A key concept to understand the interplay between autonomy and expressiveness on one side, and stability on the other side, is safety under filtering, i.e., guaranteed stability under autonomous usage of route filters. BGP route filters are used to selectively advertise specific routes to specific neighbors. In this paper, we provide a characterization of safety under filtering, filling the large gap between previously known necessary and sufficient conditions. Our characterization is based on the absence of a particular kind of dispute wheel, a structure involving circular dependencies among routing preferences. We exploit our result to show that networks admitting multiple stable states are provably unsafe under filtering, and the troublesome portion of the configuration can be pinpointed starting from the stable states alone. This is especially interesting from an operational point of view since networks with multiple stable states actually happen in practice (BGP wedgies). Finally, we show that adding filters to an existing configuration may lead to oscillations even if the configuration is safe under any link failure. Unexpectedly, we find policy configurations where misconfigured filters can do more harm than network faults.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:19 ,  Issue: 4 )

Date of Publication:

Aug. 2011

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.