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High available method for border gateway protocol version 4

  • US 20040008700A1
  • Filed: 06/27/2002
  • Published: 01/15/2004
  • Est. Priority Date: 06/27/2002
  • Status: Active Grant
First Claim
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1. A method of highly-available Border Gateway Protocol (BGP) routing in a network, comprising the steps of:

  • establishing BGP peer router connections;

    exchanging routing information with said BGP peer routers;

    running BGP protocol on two redundant physically separated control plane master control units, such that one is an active BGP instance and the other is a backup BGP instance;

    synchronizing the running configuration of said backup BGP instance with the running configuration of said active BGP instance using explicit message transmission from said active instance to said backup instance;

    copying routing information from said BGP peer routers onto said backup BGP instance;

    processing said routing information at said backup BGP instance, such that said backup BGP instance does not advertise said routing information;

    maintaining dynamic state synchronization of said backup BGP instance with said active BGP instance, such that said active BGP instance enters an ACTIVE-PROTECTED state and said backup BGP instance enters a BACKUP-PROTECT state; and

    in the event of fail-over of said active BGP instance, then seamlessly recovering without detection of said fail-over by said BGP peer routers in said network, by functionally substituting said BACKUP-PROTECT backup BGP instance for said ACTIVE-PROTECTED active BGP instance, such that said BACKUP-PROTECT backup BGP instance establishes itself as a new active BGP instance.

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