PLANET WGS3-24240 - Manual (Page 257)

User’s Manual of WGS3-24000 / WGS3-24240
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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.