iBGP and redundancy problem.

[Jeroen Massar]

> On 17 May 2026, at 17:30, Mike Neo <neomikemac at gmail.com> wrote:
> 
> Hi,
> 
> I have two bird v2 based BGP routers, connected directly by iBGP. Each router has a single link with a full BGP table. The gateway for hosts is on R1. If the ISP on R1 goes down, the hosts lose internet access, even though the internet should work via iBGP to R2, where the second ISP link is. Routes from iBGP are on R1, and iBGP has the "next hop self" parameter. Could you please advise what's missing in the configuration?

Are you BGP exchanging routes between R1 and R2?

Does R1 pull/removes the routes from the upstream when they are down.
Are R2 routes visible, likely less preferred, on R1?

Also be aware of any connection tracking, just do not, or you get into state management for that which you really want to avoid.

Regards,
 Jeroen