On Mon 05 Jan 2026 23:44:25 GMT, Lukasz Jarosz wrote:
I have N edge routers, which all of them announces exactly the same prefixes to different upstreams. They are interconnected to downstream segments and between each other with common switching fabric that backs up „edge router mesh” (in iBGP sense obviously). If edge router loses connectivity to upstreams it just stops advertising to downstreams and other neighbors. Case of losing connectivity to either downstreams or other neighbors only causes suboptimal routing, but when edge router loses connectivity to switching fabric it would become kind of zombie - advertising aggregated routes to prefixes that it does not have access. This is also condition in which router ends up when is sole survivor of failure, but I don’t think this would be recoverable remotely. Also I know this might seem far fetched for some, but jackasses with excavators already ruined many days of my life ;)
I avoid announcing the routes directly from the edge routers. I originate them from RRs, so when the edge looses the connnection to the backbone, the announcement is naturally withdrawn. -- Alarig