Thursday, April 19, 2012

MPLS VPN Routes Updating



  • IGP or eBGP are advertises the CE routes in PE routing table
  • At PE router IPv4 routes learned from the CE router is inserted into VRF routing table
  • PE routers are fully meshed with MP-BGP.
  • To this updated VRF routes RD is added & make them VPNv4 route & then RTs are added.
  • Then these VPNv4 routes are redistribute into MP-BGP.
  • The iBGP between PEs advertises the VPNv4 route with MPLS label & RTs
  •  RTs tells that which vrf can import which route.
  • After that RD is removed from VPNv4 route.
  •  Then IPv4 route is inserted into VRF routing table.
  • PE advertises these routes towards the customer routers.



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