Styles of BGP Implementations

From perspective of Customer rather than ISP or Service Provider.

  • Default Route Only – rather than receive the entire BGP routing table, only a default route is sent or static default routes configured.  Permits basic load balancing and primarily used in Active/Passive scenario.  Great for incoming redundancy.
  • Receive Partial Updates – useful if there are branch offices out in the cloud that have better connectivity to certain providers.  Filters are applied either by the ISP or local BGP administrator so that only specific “interesting” routes are received.
  • Full Updates – receive entire Internet routing table from both ISP’s.  Each copy is stored on the edge router (needs lots of memory).  Most flexible deployment but most resource intensive.

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