> [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.
Furthermore, once there is detection, the adjacencies need to update LSAs/LSPs and flood them. Flooding may require many hops to get to the ABR. If your requirement really is one millisecond, then nothing that we’ve discussed is even the right order of magnitude. Tony
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