Multiple BGP peering on two ebgp routers on two separate interface

[ramrao1455]

HI,

I need your help to understand if this is recommended design to configure multiple ebgp peering between two routers on two separate interfaces. If you think if this is not recommended then help with those points that's reason we should not recommend or use this type of design in network.  

Uploaded diagram as well.

Thanks in advance. 

[Georg Pauwen]

Hello,

the configuration is good. Keep in mind that by default, BGP only selects a single best path for each prefix. It doesn’t do ECMP (Equal Cost Multi-Path Routing), but you can enable it by configuring 'maximum-paths 2' under the BGP processes.

[ramrao1455]

Yes. I know but my main query was if such type of design is recommended in network deployment ?  

[MHM Cisco World]

only one BGP TCP will initiate, 

better is 

config loopback and use it as update BGP and hence you will have two peer connect through two separate link "run static or any other routing protocol".

[ramrao1455]

Thanks for all your recommendation.

I am looking for problems in Multiple BGP peering on two ebgp routers. Why we should avoid this type of design. 

[MHM Cisco World]

for each peer there is only one router-id and since this router-id send to same neighbor, so neighbor will only select one tcp and other will suspend.

so this design not given redundancy.

[MHM Cisco World]

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html

[ramrao1455]

This document is for multi hop config.  I am not looking for this.   

Can you please give more information on "only one BGP TCP will initiate" or about my question.

[paul driver]

Hello
load sharing would be applicable based on your design with the two rtrs peering with each other on a logical interface(loopback) via their two physical interfaces as the transit path.

This way you would have not only a resilient design but be able to multipath the traffic (load share) between the rtrs.

example both rtrs
router eigrp xx
no auto-summary 
network 0.0.0.0 0.0.0.0

router bgp xx
neighbour x.x.x.x remote-as x
neighbour x.x.x.x update-source loopback x
neighbour x.x.x.x ebgp-multihop

[ramrao1455]

I am looking for problems in Multiple BGP peering on two ebgp routers. Why we should avoid this type of design.