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OSPF Immediate Hello draft-kou-ospf-immediately-replying-hello-00.txt

OSPF Immediate Hello draft-kou-ospf-immediately-replying-hello-00.txt. Zengjie Kou Xiaoyi Guo. Problems of normal OSPF Hello. Each router sends Hello independently without responding to its neighbors The speed of neighbor discovery is slow

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OSPF Immediate Hello draft-kou-ospf-immediately-replying-hello-00.txt

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  1. OSPF Immediate Hello draft-kou-ospf-immediately-replying-hello-00.txt Zengjie Kou Xiaoyi Guo

  2. Problems of normal OSPF Hello • Each router sends Hello independently without responding to its neighbors • The speed of neighbor discovery is slow • Recovery of down link (e.g. interface flapping) is slow

  3. Mechanisms of Immediate Hello • When receiving a Hello, the OSPF router immediately replies Hello to its neighbors. After reaching “Full” state, it resumes normal hello. • When the OSPF router’s neighbor state changing from "2-Way" or greater state back to "Init", it immediately sends Hello • On broadcast and NBMA, the OSPF router sends Hello immediately when its interface rolechanged.

  4. Benefits of Immediate hello • On P2P, P2MP, virtual link, the time an OSPF router need to reach “ExStart” state is reduced from about 10 seconds to sub-second • On broadcast, the time to reach “ExStart” state is reduced from about 10 seconds to sub-second when a link goes down then up

  5. Convergence Time: Hello v.s. Immediate Hello (P2P) The time for DUT to reach “Full” state (millisecond) :

  6. Convergence Time: Hello v.s. Immediate Hello (broadcast/NBMA) The time for DUT to reach “Full” state (millisecond) : The experiment data is similar to P2P scenario

  7. Question and comment? • Working group draft?

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