Synchronization

• In Cisco IOS, BGP does not advertise a route before all routers in the AS have learned it via an IGP

  • This is a default which is unhelpful to most ISPs

• Disable synchronization if:

  • AS doesn’t pass traffic from one AS to another, or
  • All transit routers in AS run BGP, or
  • iBGP is used across backbone

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