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