Seamless network-wide IGP migrations

Laurent Vanbever, Stefano Vissicchio, Cristel Pelsser, Pierre Francois, Olivier Bonaventure
2011 Computer communication review  
Network-wide migrations of a running network, such as the replacement of a routing protocol or the modification of its configuration, can improve the performance, scalability, manageability, and security of the entire network. However, such migrations are an important source of concerns for network operators as the reconfiguration campaign can lead to long and service-affecting outages. In this paper, we propose a methodology which addresses the problem of seamlessly modifying the configuration
more » ... of commonly used link-state Interior Gateway Protocols (IGP). We illustrate the benefits of our methodology by considering several migration scenarios, including the addition or the removal of routing hierarchy in an existing IGP and the replacement of one IGP with another. We prove that a strict operational ordering can guarantee that the migration will not create IP transit service outages. Although finding a safe ordering is NPcomplete, we describe techniques which efficiently find...
doi:10.1145/2043164.2018473 fatcat:wt62j7apefg6dp62ehb56jd45m