[c-nsp] OSPF router gets separated from a broadcast domain

[Gabor Ivanszky]

Christopher E. Brown wrote:
>
>> the point is that even if all your devices speak OSPF, they will 
>> suffer from this issue as well.
>> d4 speaking OSPF doesn't help Router A not to use it's connected 
>> interface to try to reach the network, and d4 also(and all the 
>> possible networks behind d4), still creating the blackhole, as far as 
>> our tests shows.
>>
>>
>
> The point is that subnets should be transport or destination, *not 
> both*.  The partition of a OSPF speaking transport network does not 
> matter, only the partition of a destination subnet (or a shared 
> transport+dest subnet).
>
>
That makes sense. But our experience in a real life scenario is that the 
partitioning of  "OSPF speaking transport network" creates the blackhole 
as well. I will try to build this in the lab. May the root cause of the 
blackhole wasn't the network separation, but something else...

many thanks!