OSPF VIRTUAL LINK ...  

Friday, February 20, 2009

OSPF LAB VIRTUAL LINKS:

WHY SHOULD EVERYTHING CONNECT TO AREA 0:

In order to make sure that spf is executed properly , area 0
is used as reference point for all other areas in the network

Hence all other areas must have a direct adjacency to area 0

So, the discontiguos area should be connceted to area 0 thorugh
any transit area attached to it , through virtual links

Hence , after the configuration the entire set of ospf
databases will be synced and full connectivity will be esatblished

DOC:

To define ospf virtual link, use the area virtual-link command in
router


Usage Guidelines :

In ospf , all areas must be connected to a backbone router .If
the connection to backbone is lost it can be repaired using
virtual-links

For a virtual link to be properly configured , each
virtual link neighbor must include transit area id and the
corresponding virtual link neighbor router id





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