VPN Service Provider Deployment Considerations

In previous chapters, we've discussed three basic deployment options for BGP within an autonomous system:

  • Running iBGP full mesh between all of the BGP speakers within the autonomous system.

  • Running route reflectors to reduce the full mesh while maintaining full routing information at every BGP speaker in the autonomous system.

  • Breaking the autonomous system up into subAS's, creating a confederation of autonomous systems that appear to be a single AS to external networks.

Routes with additional attributes to support MPLS/BGP VPNs are exchanged in the normal way between BGP speakers, so we are going to have the same issues with scaling and deployment. While a full mesh of BGP peers are the simplest ...

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