OSPF - Borders Areas Routers

[varios]

Can we made one interface between Area 0 and Area 1 with two routers each areas (redundancy) ?

[Julio E. Moisa]

Hi

You cannot have a subnet configured on a physical interface over  2 different OSPF areas, but if you have logical interface like sub interfaces (different networks) you can have them over different areas, you will need a switch to interconnect the 3 routers.

:-)

[varios]

Hi,

Many thanks!

We would like to implemented the second solution (redundancy solution).

Its possible? And how? Maybe with another loop optical fibres ?

[Julio E. Moisa]

Hi

You can do that if you are using sub-interfaces. 

[paul driver]

Hello

You can utilize sub interfaces as Julio suggested or use separate physical interfaces and redistribute your prefixes over both of them, the first will give you logical resiliency the second will give you physical resiliency

Without any other changes you will then have equal cost load sharing for your redistributed routes which can be manipulated on either side of the peering via ospf cost, this would be better than applying you prefix to a specific area as the backbone area 0 would always take precedence over non backbone ospf areas.

res
Paul