TY - GEN
T1 - Neighbor-specific BGP
T2 - 11th International Joint Conference on Measurement and Modeling of Computer Systems, SIGMETRICS/Performance'09
AU - Wang, Yi
AU - Schapira, Michael
AU - Rexford, Jennifer
PY - 2009
Y1 - 2009
N2 - The Border Gateway Protocol (BGP) offers network administrators considerable flexibility in controlling how traffic flows through their networks. However, the interaction between routing policies in different Autonomous Systems (ASes) can lead to protocol oscillation. The best-known sufficient conditions of BGP global routing stability impose restrictions on the kinds of local routing policies individual ASes can safely implement. In this paper, we present neighbor-specific BGP (NS-BGP), a modest extension to BGP that enables a much wider range of local policies without compromising global stability. Whereas a conventional BGP-speaking router selects a single "best" route (for each destination prefix), NS-BGP allows a router to customize the route selection on behalf of each neighbor. For example, one neighbor may prefer the shortest route, another the most secure route, and yet another the least expensive route. Surprisingly, we prove that the much more flexible NS-BGP is guaranteed to be stable under much less restrictive conditions on how routers "rank" the candidate routes. We also show that it is safe to deploy NS-BGP incrementally, as a routing system with a partial deployment of NS-BGP is guaranteed to be stable, even in the presence of failure and other topology changes. In addition to our theoretical results, we also describe how NS-BGP can be deployed by individual ASes independently without changes to the BGP message format or collaboration from neighboring ASes.
AB - The Border Gateway Protocol (BGP) offers network administrators considerable flexibility in controlling how traffic flows through their networks. However, the interaction between routing policies in different Autonomous Systems (ASes) can lead to protocol oscillation. The best-known sufficient conditions of BGP global routing stability impose restrictions on the kinds of local routing policies individual ASes can safely implement. In this paper, we present neighbor-specific BGP (NS-BGP), a modest extension to BGP that enables a much wider range of local policies without compromising global stability. Whereas a conventional BGP-speaking router selects a single "best" route (for each destination prefix), NS-BGP allows a router to customize the route selection on behalf of each neighbor. For example, one neighbor may prefer the shortest route, another the most secure route, and yet another the least expensive route. Surprisingly, we prove that the much more flexible NS-BGP is guaranteed to be stable under much less restrictive conditions on how routers "rank" the candidate routes. We also show that it is safe to deploy NS-BGP incrementally, as a routing system with a partial deployment of NS-BGP is guaranteed to be stable, even in the presence of failure and other topology changes. In addition to our theoretical results, we also describe how NS-BGP can be deployed by individual ASes independently without changes to the BGP message format or collaboration from neighboring ASes.
KW - Algorithm
KW - C.2.2 [computer-communication networks]: Network protocols
KW - Design
KW - Theory
UR - http://www.scopus.com/inward/record.url?scp=70449657894&partnerID=8YFLogxK
U2 - 10.1145/1555349.1555375
DO - 10.1145/1555349.1555375
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AN - SCOPUS:70449657894
SN - 9781605585116
T3 - SIGMETRICS/Performance'09 - Proceedings of the 11th International Joint Conference on Measurement and Modeling of Computer Systems
SP - 217
EP - 228
BT - SIGMETRICS/Performance'09 - Proceedings of the 11th International Joint Conference on Measurement and Modeling of Computer Systems
Y2 - 15 June 2009 through 19 June 2009
ER -