On 2026-01-11, Remi Locherer <[email protected]> wrote:
> Hi,
>
> For a BGP route reflector setup I want to set next hop self
> towards iBGP peers. But only for routes learnt through eBGP.
>
> In the RIB I can see this:
>
> dut# bgpctl sh rib det 172.0.42.0/24
>
> BGP routing table entry for 172.0.42.0/24
> Nexthop 10.100.0.10 (via 10.1.0.2) Neighbor r1 (10.100.0.10)
> Origin IGP, metric 0, localpref 100, weight 0, ovs not-found, avs
> unknown, internal, valid, best
>
> ^^^^^^^^
> Last update: 00:58:22 ago
> Originator Id: 10.100.0.10
> Cluster Id List: 10.0.0.42
>
> BGP routing table entry for 172.0.42.0/24
> Nexthop 10.100.0.10 (via 10.1.0.2) Neighbor rr2 (10.100.0.2)
> Origin IGP, metric 0, localpref 100, weight 0, ovs not-found, avs
> unknown, internal, valid, ecmp
>
> ^^^^^^^^
> Last update: 00:58:24 ago
> Originator Id: 10.100.0.10
> Cluster Id List: 10.0.0.42 10.0.0.43
>
> BGP routing table entry for 172.0.42.0/24
> 65101 65000
> Nexthop 10.1.0.14 (via 10.1.0.14) Neighbor x1 (172.42.42.1)
> Origin IGP, metric 0, localpref 100, weight 0, ovs not-found, avs
> unknown, external
>
> ^^^^^^^^
> Last update: 00:58:24 ago
> Originator Id: 10.100.0.1
> Cluster Id List: 10.0.0.42
> dut#
>
> With "set nexthop self" for a given neighbor the nexthop is changed
> unconditinally for this neighbor. How can I match only on external
> routes?
I have this, is that what you're after? (obviously skip the community
setting if you don't want it).
match from ebgp set { community $ASN:neighbor-as, nexthop self }
