BGP -Best path selection - Page 2

Cisconew · ‎03-03-2022

Hi all,
I have configured BGP on R1,R2 & R3.

R1 & R2 : IBGP : (ASN: 65100)

R3 - ASN: 64519

R3 received 192.169.1.0/24 prefix from R1 & R2. 

R3 chosen route from R2 as best path.
Based on which attribute R3 selected the best Path?

Can someone explain, why ?

Network Topology:

Show bgp commands for reference:

paul driver · ‎03-04-2022

Hello @MHM Cisco World

the reason for the med looks like only a single ibgp rtr is originating the prefix but as stated if both Ibgp rtrs originated it then all things will be equal up to the comparing the rids

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Kind Regards
Paul

MHM Cisco World · ‎03-04-2022

Yes but the R2 inject router and add MED attribute and MED not pass AS boundary, so R1 will forward router to R3 without the MED.
Issue here that the R3 receive the router from two paths one with MED and other without MED value, this make R3 prefer the path with lowest MED value which is through R2.