Cisco IOS BGP Best Path Selection

Cisco IOS BGP Best Path Selection

1.   Select the path which has the highest weight.

2.   Select the path which has the highest local-preference

3.   Select the path which was locally originated via a network or aggregate command or through redistribution.

4.   Select the path which has the shortest AS_PATH.

5.   Select the path which has the lowest origin type(igp<egp<incomplete).

6.   Select the path which has the lowest med.

7.   Select the  eBGP paths rather than iBGP paths.

8.   Select the path which has the lowest IGP metric to the BGP next hop.

9.   Select the path which was received first, when all paths are external

10.  Select the path which comes from a neighbor that has lowest Router-id.

11.  Select the path which has the minimum cluster list length, when the originator  is the same for all paths.It is used  when there is a Route-Reflector in the topology.

12.  Select the path which comes from the lowest neighbor address.