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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 |
| 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 |
| 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: |
| Default: For broadcast interfaces, the default hello interval is 10 seconds. For |
| |
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: |
| Default: For broadcast interfaces, the default dead interval is 40 seconds. For |
| |
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 |
| any two routers on the attached network. Be conservative when setting this value |
| to prevent necessary retransmissions. |
| Range is |
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 |
|
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362 | Nokia Network Voyager for IPSO 4.0 Reference Guide |