I can't get to the server where I have a tested configuration for an
approach to partitioned nonzero repair, but let me describe one hack
I've done. It's either very elegant or very ugly. It is the mirror
image of restoring the backbone using a virtual link through a
nonzero area.
1. Assume ABR1 and ABR2 are not adjacent in area 0.0.0.0, but can reach
one another, preferably by more than one path, via backbone routing.
2. ABR1 and ABR2 both have an interface in area 0.0.0.5.
3. Create a GRE tunnel between ABR1 and ABR2, using endpoints in area 0.0.0.0
Assign the tunnel internal address to be within the address space of
0.0.0.5. Give this subnet a very high OSPF metric, but put it in area
0.0.0.5.
4. If area 0.0.0.5 becomes partitioned due to an internal failure, the
high-metric link will become the only available link in the next
SPF calculations, and restore area 0.0.0.5 through area 0.0.0.0.
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