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User's Manual of WGS3-2820/WGS3-5220
4.6.4 OSPF
To implement OSPF for a large network, you must first organize the network into logical areas to limit the number
of OSPF routers that actively exchange Link State Advertisements (LSAs). You can then define an OSPF
interface by assigning an IP interface configured on this switch to one of these groups. This OSPF interface will
send and receive OSPF traffic to neighboring OSPF routers. You can further optimize the exchange of OSPF traffic
by specifying an area range that covers a large number of subnetwork addresses. This is an important technique
for limiting the amount of traffic exchanged between Area Border Routers (ABRs). And finally, you must specify a
virtual link to any OSPF area that is not physically attached to the OSPF backbone. Virtual links can also be used
to provide a redundant link between contiguous areas to prevent areas from being partitioned, or to merge
backbone areas.
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