Tony, Why would we need to deploy a full mesh of BFD or introduce a new proxy liveness service if BGP can do all what is needed here with just a few lines of additional cfg on existing and deployed operating systems ?
In respect to using BFD here - let's start with basic question - who would be the producer to install those host routes into RIB ? Note in the discussed scenario there are not there today - only summary is there. Thx, R. On Thu, Nov 18, 2021 at 5:06 PM Tony Li <tony...@tony.li> wrote: > > Les, > > Why would we then punch holes in the summary for member routers? Just > because we can? > *[LES:] No. We are doing it to improve convergence AND retain scalability.* > > > > You are not improving convergence. You are propagating liveness. The fact > that this relates to convergence in the overlay is irrelevant to the IGP. > > You are not retaining scalability. You are damaging it. You are proposing > flooding a prefix per router that fails. If there is a mass failure, that > would result in flooding a large number of prefixes. The last thing you > want when there is a mass failure is additional load, exacerbating the > situation. > > > Should we corrupt the architecture just because we can? There are other, > architecturally appropriate solutions available. How about we just use > them? > > *[LES:] What are you proposing?* > > > > You are signaling the (lack of) liveness of a remote node. I propose that > we instead use existing signaling mechanisms to do this. Multi-hop BFD > seems like an obvious choice. > > If you greatly dislike that for some reason, I would suggest that we > create a proxy liveness service, advertised by the ABR. This would allow > correspondents to register for notifications. The ABR could signal these > unicast when it determines that the specific targets are unreachable. > > Tony > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr >
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