> Such results can be deducted from active LSA updates. That is great !
With just a little caveat ... those active LSA updates arriving on ABRs must be triggered by some network event. And that is precisely what we are talking about here. Kind regards, R. On Tue, Nov 23, 2021 at 4:14 PM Aijun Wang <wangai...@tsinghua.org.cn> wrote: > Hi, Robert: > > Aijun Wang > China Telecom > > On Nov 23, 2021, at 21:22, Robert Raszuk <rob...@raszuk.net> wrote: > > > > [WAJ] What I want to express is the overall time from the failures occur >> to the ABR notice it via only IGP procedures. Shouldn’t it be within >> millisecond within one area? >> > > No. Not at all. > > OSPF hello def timer is 10 sec in some implementations I just checked. > > So unless you can quickly detect the failure, all works discussed are > pointless. That's why your statement that no BFD is needed is just not > correct. > > And if BFD is there as a prerequisite it can equally bring IGP adj down or > BGP session down. > > [WAJ] we do not care the liveness of OSPF instance. What we want to know > is the reachable or unreachable status of some host routes. Such results > can be deducted from active LSA updates. > > Thx a lot, > R. > > >
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