BGP CHAPTER 19 - BGP PATH SELECTION

 In BGP Table – If there are multiple paths to reach a destination network then BGP PATH SELECTION comes into picture.

 

 

 

Unlike other Routing Protocol it is very different 

Can’t Compare with IGPs –RIP , OSPF , EIGRP 

BGP ATTRIBUTES PLAYS A VERY IMPORTANT ROLE

 BGP PATH SELECTION MNEMONIC 

“We Love Oranges AS Oranges Mean Pure Refreshment”

 

 BGP PATH SELECTION

 Condition :- The route should have valid Next hop then it will consider for BGP Path Selection.

Highest Weight is preferred.(local to the router)

Highest Local Preference is preferred.

Locally Originate routes are preferred.

Shortest AS Path is preferred.

Lowest Origin code is preferred.

Lowest MED value is preferred.

Path - EBGP is preferred over IBGP.

The path with the lowest BGP neighbor Router ID . 

Few more ………….  

The path within the AS with the lowest IGP metric to the BGP next hop

Oldest Path – the path that was received first

The path with the lowest neighbor IP address.

 

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