> Of Saku Ytti > Sent: Sunday, July 15, 2018 10:32 AM > > Hey James, > > Thanks, I was not aware of this feature. How does it compare to PIC Edge? > Aren't both solving issue of ingress node rapidly choosing different egress > node from two installed options? > > I think we have two secenarios: > > P2---PE2--CE2 > | | > CE1 -- PE1 -- P1 | > | | > P3---PE3---+ > > * CE1 primarily chooses PE2->CE2 > > a) If P2->PE2 goes down, we have to wait for PE1 to experience it, after PE1 > experiences it, it can immediately redirect to PE3 > b) If PE2->CE2 goes down, PE2 should be able to redirect to PE3 > > It wasn't obvious to me can this newer mechanism out-perform PIC Edge? > > In case b) I think they should be equal, in both cases we don't need to wait > for network, the PE2 can locally choose to redirect to PE3 until it stops > receiving packets. > > But I'm not sure if this new mechanism makes a) better, does PE1 still need > to know about PE2 failure, or can the network itself move traffic to PE3 > before PE1 knows PE2 has failed? It might, because there is same IP, but I'm > not sure. >
Yes with this one you don't need to tune IGP to propagate the info about egress node failure all the way to ingress PEs (so the ingress PE can switch to alternate path e.g. using PIC "core") (where this info propagation might be slowed down significantly in multi-AS environments with BGP-LS between AS-es). This feature allows the P node directly adjacent to the failed egress PE node to initiate the failover to an alternate PE, which as you can see significantly reduces the convergence time. But this feature solves only egress PE node failure protection (no need for PIC "core" or IGP tuning), that is BGP-PIC Edge is still needed to protect for egress PE-CE link failures. @James is on my todo list so maybe we can exchange notes, (I plan on using it in RSVP-TE environment so the added complexity will be only marginal). Yes I've been waiting for this feature for quite some time in cisco (got promises that maybe on SR) -maybe you can dig some of the old threads I had with Oliver Boehmer on this adam netconsultings.com ::carrier-class solutions for the telecommunications industry:: _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp