• iBGP loop prevention
    • filters routes by default
      • Routes learned via iBGP cannot be passed on to additional iBGP neighbors.
      • Requires full mesh or confederation.
  • Full mesh advantage:
    • All BGP peers learn all paths.
    • All BgP peers know closest egress.
    • Hot Potato Routing.
  • Full mesh disadvantage:
    • Does not scale, too many peerings.
  • Partial mesh
    • mesh, route reflector and confed can interoperate.
    • advantageous for scaling
      • can use RR and pockets of full mesh.
  • Route Reflector
    • RFC 4456
    • RR summarizes routing information and only reflects best path.
    • IGP metrics are taken into account typically with route reflectors.

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