Thanks Acee On Mon, Oct 9, 2023 at 9:34 AM Acee Lindem <acee.i...@gmail.com> wrote:
> Hi Gyan, > > > On Oct 9, 2023, at 02:07, Gyan Mishra <hayabusa...@gmail.com> wrote: > > > > > > Dear authors > > > > I reviewed this draft presented at IETF 117 and would like to provide > some feedback. > > > > I agree with the problem statement that the restart router all its LSAs > still exist on all routers in the area until they maxage naturally. Am > wondering if this is really a problem that needs to be fixed. > > > > I have never seen this cause any impact to routing aa this has existed > Day 1. > > > > Once the router is down the intra area routes from the default RIB > routing table are immediately removed, however even though the routes still > exist in the LSDB that has no impact on the RIB / FIB hardware programming > of the forwarding plane. > > > > I agree maybe as a cleanup process it maybe good to purge the LSDB, > however naturally when the restart router establishes all its adj again to > FULL during the FSM and flooding full SPF calc the new LSAs lower sequence > numbers are flooded and the older stale LSAs are purged automatically by > design. > > And the draft doesn’t change this - we are working on an update where this > is clearer. > > > > > How does this new process of purging impact GR grace lsa restart router > to helper router negotiation process of graceful restart and marking the > old routes and LSDB entires as stale from the restart router for forwarding > for Routing engine or processor switchover negotiated so traffic can flow > hitless throughout the switchover process. > > You wouldn’t do this in the case of graceful restart - refer to RFC 3620. > The data plane on the restarting router learns it pre-restart LSAs from its > neighbors. > > > > > > As well the NSR non stop routing db checkpoint between active and > standby route processor or engine locally significant not negotiated with > neighbors. > > With NSR, the OSPF state is sync’ed and, in effect, there is no OSPF > restart. Of course, this isn’t specified in any standard. > > It would be good for you to review the update version. > > Thanks, > Acee > > Will do > > > > > > Kind Regards > > > > Gyan > >
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