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3
Interfaces
Figure 3-10: Configuration | Interfaces | WAN Card in Slot N | Port A B as T1 or E1 screen, OSPF tab
OSPF Parameters tab
OSPF is a routing protocol that routers use for messages to other routers, to determine network
connectivity, status, and optimum paths for sending data traffic. OSPF uses link-state routing algorithms,
and it is a newer protocol than RIP. It generates less network traffic and generally provides faster routing
updates, but it requires more processing power than RIP. The VPN Concentrator includes IP routing
functions that support OSPF version 2 (RFC 2328).
OSPF involves interface-specific parameters that you configure here, and system-wide parameters that
you configure on the Configuration | System | IP Routing screens.
OSPF Enabled
To enable OSPF routing on this interface, check the box. (By default it is not checked.)
To activate the OSPF system, you must also configure and enable OSPF on the Configuration | System | IP
Routing | OSPF
OSPF Area ID
The area ID identifies the subnet area within the OSPF Autonomous System or domain. Routers within
an area have identical link-state databases. While its format is that of a dotted decimal IP address, the
ID is only an identifier and not an address.
The 0.0.0.0 area ID identifies a special area—the backbone—that contains all area border routers,
which are the routers connected to multiple areas.
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