I have a 100+ routers in our backbone currently. I always used on all routers:

/routing ospf network> print
Flags: X - disabled, I - invalid
# NETWORK AREA
0 10.10.10.0/23 backbone

Recently I started using only the /30 subnets between peers ... which gets me to wondering now, if I want to make another area somewhere in my network (not backbone) and I end up using a /30 in that 10.10.10.0/23 range will all the routers think its part of the backbone or do they not care?

/routing ospf network> print
Flags: X - disabled, I - invalid
# NETWORK AREA
0 10.10.10.30.0/30 area2

Basically can backbone and area2 have overlapping ip ranges, as long as its not on the direct neighbors of that area border?

Thx!