MPLS VPN Components4. Multi-protocol extensions to BGP-4

• iMBGP update consists of:

  • VPN-IPv4 prefix
  • Next hop address (loopback interface of PE)
  • Extended community attributes (route target, SOO)
  • MPLS label which represents:
    • Either: the PE’s outgoing interface
    • Or: the VRF where a lookup has to be done (aggregate label)
  • Other standard BGP attributes
    • Local Preference
    • MED
    • AS_PATH
    • Standard Community

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