Sunday, April 8, 2012

Distribution of LABEL BINDING


  • Each LSR in network have independent & local  decision when forwarding ip packet.
  • Label Binding:
    • Each LSR in the network makes an independent, local decision as to which label value to use to represent a Forwarding Equivalence Class (different or same ip packets with same forwarding function).
  • Each LSR informs its neighbors of the label bindings it has made.
  • For this following protocols are used:
    • TDP: Tag Distribution Protocol
      • MPLS forwarding along normally routed path
      • Cisco proprietorial and legacy 
    • RSVP: Resource Reservation Protocol
      • To support MPLS traffic engineering.
    • BGP: Border Gateway Protocol
      • Used to support MPLS VPNs
  • Label value changes as the ip packet traverse the network.
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