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362 Nokia Network Voyager for IPSO 4.0 Reference Guide
Configuring OSPF Interfaces
Table 25 lists the parameters for interfaces that you use when configuring OSPF on your
platform.
Table 25 Configuration Parameters for OSPF Interfaces
Parameter Description
Area The drop-down list displays all of the areas configured and enabled on your
platform. An entry for the backbone area is displayed even if it is disabled.
An OSPF area defines a group of routers running OSPF that have the complete
topology information of the given area. OSPF areas use an area border router
(ABR) to exchange information about routes. Routes for a given area are
summarized into the backbone area for distribution into other non-backbone
areas. An ABR must have at least two interfaces in at least two different areas.
For information on adding an area “Configuring OSPF Areas and Global
Settings” on page 357.
Hello interval Specifies the length of time in seconds between hello packets that the router
sends on this interface. For a given link, this value must be the same on all
routers, or adjacencies do not form.
Range: 1-65535 in seconds
Default: For broadcast interfaces, the default hello interval is 10 seconds. For
point-to-point interfaces, the default hello interval is 30 seconds.
Dead interval Specifies the number of seconds after the router stops receiving hello packets
that it declares the neighbor is down. Typically, this value should be four times
the hello interval. For a given link, this value must be the same on all routers, or
adjacencies do not form. The value must not be 0.
Range: 1-65535 in seconds.
Default: For broadcast interfaces, the default dead interval is 40 seconds. For
point-to-point interfaces, the default dead interval is 120 seconds.
Retransmit interval Specifies the number of seconds between LSA retransmissions for this interface.
This value is also used when retransmitting database description and link state
request packets. Set this value well above the expected round-trip delay between
any two routers on the attached network. Be conservative when setting this value
to prevent necessary retransmissions.
Range is 1-65535 in seconds. Default is 5.
OSPF cost Specifies the weight of a given path in a route. The higher the cost you configure,
the less preferred the link as an OSPF route. For example, you can assign
different relative costs to two interfaces to make one more preferred as a routing
path. You can explicitly override this value in route redistribution.
Range is 1-65535. Default is 1.