> [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. Thx a lot, R.
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