OSPF issue

Unanswered Question
Reza Sharifi Fri, 01/01/2010 - 21:26
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Hello Sandeep,

In order for 2 routers to form an adjacency with each other, they have to be in the same area.

For example:

If you have router-1 and router-2 (below) and there is a link between these 2 routers, in order for them to become neighbors, the 2 interfaces must be in the same area.






Muhammad Anser Khan Fri, 01/01/2010 - 22:29
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Dear Sandeep,

Two diferrent non-backbone areas are necessary to connect with Area 0 for the communication. Neihgbor relationship can be happen within the same area.

Virtual-Link is the solution to communicate non-backbone areas:

For example:

R1 >> Area 0  R2 >>  Area 1  R3 >>  Area 2  R4

By default Area2 cannot communicate with Area 1 or Area 0.

If we create Virtual-link between R2 and R3. Then Area 2 can communite with Area 1 and Area 0. R3 become an ABR and generates Inter-Area routes to Area 1.




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