Improving Network Agility with Seamless BGP Reconfigurations

Authors: Stefano Vissicchio, Laurent Vanbever, Cristel Pelsser, Luca Cittadini, Pierre Francois, and Olivier Bonaventure
IEEE/ACM Transactions on Networking, Volume 21, Issue 3
2013 IETF/IRTF Applied Networking Research Prize


The network infrastructure of Internet Service Providers (ISPs) undergoes constant evolution. Whenever new requirements arise (e.g., the deployment of a new Point of Presence, or a change in the business relationship with a neighboring ISP), operators need to change the configuration of the network. Due to the complexity of BGP and to the lack of methodologies and tools, maintaining service availability during reconfigurations that involve BGP is a challenge for operators. In this paper, we show that the current best practices to reconfigure BGP do not provide guarantees with respect to traffic disruptions. Then, we study the problem of finding an operational ordering of BGP reconfiguration steps which guarantees no packet loss. Unfortunately, finding such an operational ordering, when it exists, is computationally hard. To enable lossless reconfigurations, we propose a framework that extends current features of carrier-grade routers to run two BGP control planes in parallel. We present a prototype implementation and we show the effectiveness of our framework through a case study.



	title={Improving network agility with seamless BGP reconfigurations},
	author={Vissicchio, Stefano and Vanbever, Laurent and Pelsser, Cristel and Cittadini, Luca and Francois, Pierre and Bonaventure, Olivier},
	journal={IEEE/ACM Transactions on Networking (TON)},
	publisher={IEEE Press}

DOI: 10.1109/TNET.2012.2217506