11 CSE 222A Lecture 12 WAN Routing Alternatives vnodes vnode virtual node

11 cse 222a lecture 12 wan routing alternatives

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11 CSE 222A – Lecture 12: WAN Routing Alternatives
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vnodes vnode : virtual node within an AS Walla Walla New York San Diego Roosterville Crumstown 12 CSE 222A – Lecture 12: WAN Routing Alternatives
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Pathlets A B C D Packet route field Forwarding table 7 2 ... ... 2 fwd to D ... ... 7 fwd to C 7,2 2 13 CSE 222A – Lecture 12: WAN Routing Alternatives delivered!
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Pathlets ... ... 2 fwd to D ... ... 7 fwd to C 7,2 2 delivered! ... ... 3 push 7,2 ; fwd to B 3 7 2 3 A B C D 14 CSE 222A – Lecture 12: WAN Routing Alternatives Packet route field Forwarding table
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Dissemination Global gossip fine, except for scalability So, let routers choose not to disseminate some pathlets Leads to (ironic) use of path vector –– only for pathlet dissemination, not route selection 15 CSE 222A – Lecture 12: WAN Routing Alternatives
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Local transit policies Each ingress egress pair is either allowed or disallowed . Subject to this, any path allowed! Represented with few pathlets: small FIB 16 CSE 222A – Lecture 12: WAN Routing Alternatives
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ingress from a provider ingress from a customer All valley - free is local ± customers can route to anyone; anyone can route to customers ² provider provider customer customer egress to a customer egress to a provider Forwarding table size: 3 + #neighbors 17 CSE 222A – Lecture 12: WAN Routing Alternatives
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Choice for senders source destination Local transit policies provide some policy control for networks, while enabling a large number of paths for senders. 18 CSE 222A – Lecture 12: WAN Routing Alternatives
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Emulating BGP 128.2.0.0/16 19 CSE 222A – Lecture 12: WAN Routing Alternatives
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Mixed policies local BGP-like local local local 20 CSE 222A – Lecture 12: WAN Routing Alternatives
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Improved connectivity BGP-style LT policies Mixed 21 CSE 222A – Lecture 12: WAN Routing Alternatives
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Tiny forwarding tables Forwarding table size CDF current Internet (CAIDA/APNIC): 132,158+ entries: one per IP prefix 2,264 entries, max 8.48 entries, mean 22 CSE 222A – Lecture 12: WAN Routing Alternatives BGP pathlet routing, valley-free LT policies
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Control overhead 2.23x more messages, 1.61x more memory in LT than PV This can likely be improved. 23 CSE 222A – Lecture 12: WAN Routing Alternatives
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Comparing protocols Feedback-based routing Strict source routing Pathlet routing NIRA Routing deflections, path splicing LISP BGP MIRO Loose source routing 24 CSE 222A – Lecture 12: WAN Routing Alternatives
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Conclusion Pathlet routing: source routing over a virtual
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  • Fall '08
  • Vahdat,A
  • routing protocol

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