Posted on January 13, 2020 5:03 pm
 |  Asked by sowmya krishnaswamy
 |  138 views
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We have 2 routers R1 and R2 with 4 links between them, we want to use BGP for exchanging routes between the two routers. We would like to establish a single BGP session between the 2 routers and not configure multiple BGP sessions using the physical IP addresses on the 2 links connecting the 2 routers.

lo — R1 === R2 — lo

We are hoping to use eBGP multi-hop feature. We have a requirement to load balance the traffic to the prefixes behind R1 using different weights that are assigned to the links.

router bgp 1
neighbor 2.2.2.2 { <<< remote loopback-IP
multihop ttl 1;
update-source loopback0;
}
maximum-paths 2

static {
route 2.2.2.2 next-hop (10.10.1.1 | 10.10.2.1);
}

Since the recursive next hop is resolved via static route, there is no notion of load-balancing with un-equal weights. Is there a way to do UCMP with eBGP multi-hop for the example outlined above?

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