BGP routing changes: merging views from two ISPs
ACM SIGCOMM Computer Communication Review
COPE: traffic engineering in dynamic networks
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
A measurement study on the impact of routing events on end-to-end internet path performance
Proceedings of the 2006 conference on Applications, technologies, architectures, and protocols for computer communications
IGP link weight assignment for operational Tier-1 backbones
IEEE/ACM Transactions on Networking (TON)
Impact of hot-potato routing changes in IP networks
IEEE/ACM Transactions on Networking (TON)
R3: resilient routing reconfiguration
Proceedings of the ACM SIGCOMM 2010 conference
Flowroute: inferring forwarding table updates using passive flow-level measurements
IMC '10 Proceedings of the 10th ACM SIGCOMM conference on Internet measurement
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Typically, each Autonomous System (AS) tunes its local IS-IS or OSPF metrics without any coordination with other ASes. Such local optimizations can lead to sub-optimal end-to-end network performance, as suggested by the performance enhancements achieved by some overlay routing projects. We study the interaction of local IGP engineering in an ISP network with interdomain routing policies. Specifically, (a) how does hot-potato routing (the BGP policy of choosing the closest egress) influence the selection of IGP link metrics? and (b) how does traffic to neighboring ASes shift due to changes in the local AS驴s IGP link metrics?In our measurement study, we find that the hot-potato routing policy interacts significantly with IGP engineering - ignoring this interaction resulted in metrics sub-optimal by as much as 20% of link utilization. Further, the impact on neighboring ASes depends on peering locations and policies, and as much as 25% of traffic to a neighboring AS can shift the exit point. Such interdomain shifts can be detrimental to the performance of neighboring ASes. We rely on the actual measured network topology, IGP metrics, traffic matrix and delay bounds. Even though our results are specific to a single ISP, they show significant interaction between local IGP engineering and interdomain routing policies, and thus motivate further work on global network optimization and coordination among ISPs.