LevelOne GSW-2600TXM - Manual (Page 63)

63
OSPF Area Range Configuration
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Area Identity IP Address Address Mask Advertisement
192.168.2.0 192.168.2.0 255.255.255.0 Advertise
192.168.4.0 192.168.4.0 255.255.255.0 Advertise
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Parameter
Description
Area Identity An OSPF area that includes all the OSPF routers within the
assigned address range.
IP Address The IP address used to calculate the area range.
Address Mask The subnet mask used to calculate the area range.
Advertisement Enables or disables advertising for this range.
Note:
To add a new OSPF Area Range, use the <Add> button. To delete an existing
range, highlight the table entry with the cursor and select Enter.
OSPF Virtual Link Configuration
All OSPF areas must connect to the backbone. If an area does not have a direct
physical connection to the backbone, you can configure a virtual link that provides a
logical path to the backbone. To connect an isolated area to the backbone, the logical
path can cross a single nonbackbone area to reach the backbone. To define the path,
you must specify one endpoint on the ABR that connects the isolated area to the
common nonbackbone area, and the other endpoint on the ABR that connects this
common nonbackbone area and the backbone itself. (However, note that you cannot
configure a virtual link that runs through a stub or NSSA area.)
Virtual links can also be used to create a redundant link between any area and the
backbone to help prevent partitioning, or to connect two existing backbone areas into a
common backbone.
To configure a virtual link, specify the transit area through which the endpoint routers
connect, and the address of the router on this side of the link.