9

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.

 

 

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Nokia Network Voyager for IPSO 4.0 Reference Guide

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Nokia IPSO 4.0 manual Configuring Ospf Interfaces, Configuration Parameters for Ospf Interfaces, 362