There has been a number of efforts to implement FIB (actually BGP RIB) compression. There’s a white paper from MS research; I recall Spotify talking of running off-box BGP compression SW and re-injecting summarized BGP RIB; Volta Networks had an implementation of full BGP table compression to about 370K routes with no connectivity loss and reasonably fast reaction of topology changes/disaggregation needed(it even won some Intel price for innovation), not sure what happened to it (Volta had been acquired by IBM some time ago). To my memory - IOS-XR allows off box custom best path logic and re-injection of routes into BGP RIB
Cheers, Jeff > On Oct 10, 2022, at 09:26, William Herrin <[email protected]> wrote: > > On Mon, Oct 10, 2022 at 8:37 AM Mike Hammett <[email protected]> wrote: >> Feasibility of adding some middleware that culls unneeded routes (existing >> more specific and aggregate routes pointing to the same next hop), when that >> table starts to fill? > > This is called "FIB aggregation." It exists and works but is not widely > adopted. > > Regards, > Bill Herrin > > -- > For hire. https://bill.herrin.us/resume/
