Peer Dragnet: Tool for Analyzing Peer's Route Announcements and their Impact

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• Ashley Flavel (AT&T / University of Adelaide)
• Thursday 08 November 2007, 16:30-17:30
• Lecture Theatre 2, Computer Laboratory, William Gates Builiding.

If you have a question about this talk, please contact Eiko Yoneki.

Conventional practice in inter-domain BGP peering is for peers to advertise equally good BGP routes at every peering location. This allows the receiving service provider to determine the best possible peering link in terms of its own optimization criteria for the traffic destined to the sending peer. However, in practice, for various reasons, a peer might not send equally good routes at all peering locations, leading to unexpected routing and forwarding behavior in the service provider’s network. Thus, it is vital to monitor routes sent by peers across locations. In this talk, we introduce a tool called “Peer Dragnet” that performs this task. The tool checks if peers send consistent routes at all locations, and if not, determines the impact of inconsistent route announcements in terms of routing (e.g., how many routers choose different routes due to inconsistent announcements) and traffic (e.g., how flow of traffic changes in the network). In this talk we provide an overview of the tool, its methodology and reports that aids network operators to better understand routes sent by peers and their impact.

This is joint work with Tom Scholl and Aman Shaikh of AT&T Labs.

This talk is part of the Computer Laboratory Systems Research Group Seminar series.

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