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Explain Loop Prevention Mechanism In Bgp?

Answer»

BGP uses two MECHANISM to PREVENT loops:-

  1. When a router learns routes from an iBGP peer, that router does not advertise the same routes to ANOTHER iBGP peer.
  2. By using AS_PATH - When ADVERTISING to an eBGP peer, a BGP router adds its own ASN to the AS_PATH. If a BGP router RECEIVES an update and the route advertisement lists an AS_PATH with its own ASN, the router ignores that route.

Note - A BGP router does not add its ASN when advertising to an iBGP peer.

BGP uses two mechanism to prevent loops:-

Note - A BGP router does not add its ASN when advertising to an iBGP peer.


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