Hi Gyan, I fully understand the request.
I still question whether it should be solved by routing. This is not a path computation problem. It’s reachability and more significantly, liveness. That really seems like it’s looking for a slightly different architectural tool. Yours in IS-IS, Tony > On Oct 13, 2021, at 6:04 PM, Gyan Mishra <[email protected]> wrote: > > > Hi Tony > > This is a real world problem for large scale networks where an service > providers core network is broken up into OSPF areas or ISIS levels and each > PEs loopback BGP next hop attribute for 1000s of PEs within an area are > summarized at the P router ASBR ISIS L1-2 router or OSPF ABR and the next hop > attribute loopback0 component prefix of the summary goes down. > > So we need a mechanism to signal via PUA or event notification mechanism that > the component went down that is part of the summary to force immediately > control plane convergence to avoid black hole of traffic during the failure. > > Kind Regards > > Gyan > On Wed, Oct 13, 2021 at 8:48 PM Tony Li <[email protected] > <mailto:[email protected]>> wrote: > > > Hi, > > > I’ve said it many times before, in many different venues: “BGP is not a dump > truck!”. > > Is the fact that I didn’t mention the IGPs taken as some indication that they > are fair game? > > No, the IGPs aren’t a dump truck either. > > We have a clear, unambiguous way of signaling individual system outages > already. You advertise a loopback address as a /32 or /128. > If your host goes down, the address is no longer routable. Done. > > If this technique is not sufficient, then perhaps it doesn’t belong in > routing. > > Tony > > _______________________________________________ > Lsr mailing list > [email protected] <mailto:[email protected]> > https://www.ietf.org/mailman/listinfo/lsr > <https://www.ietf.org/mailman/listinfo/lsr> > -- > <http://www.verizon.com/> > Gyan Mishra > Network Solutions Architect > Email [email protected] <mailto:[email protected]> > M 301 502-1347 > >
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