AIS AI2524 user manual Configure Ospf for Nonbroadcast Networks, Configure Ospf Area Parameters

AI2524 Router Card User’s Manual

Configure OSPF for Nonbroadcast Networks

Because there might be many routers attached to an OSPF network, a designated router is selected for the network. It is necessary to use spe- cial configuration parameters in the designated router selection if broadcast capability is not configured.

These parameters need only be configured in those devices that are themselves eligible to become the designated router or backup desig- nated router

To configure routers that interconnect to nonbroadcast networks, type this command in router configuration mode:

neighbor ip-address[priority number] [poll-interval seconds]

You can specify the following neighbor parameters, as required:

zPriority for a neighboring route

zNonbroadcast poll interval

zInterface through which the neighbor is reachable

Configure OSPF Area Parameters

OSPF software allows you to configure several area parameters. Thes area parameters, shown in the following list, include enabling authen- tication, defining stub areas, and assigning specific costs to the default summary route. Authentication allows password-based protection against unauthorized access to an area.

Stub areas are areas into which information on external routes is not sent. Instead, there is a default external route generated by the area bor- der router, into the stub area for destinations outside the autonomous system. To further reduce the number of link state advertisements sent into a stub area, you can configur no-summaryon the Area Border Router (ABR) to prevent it from sending summary link advertisement (link state advertisements Type 3) into the stub area.

In router configuration mode, specify any of these area parameters as needed for your network:

zEnable authentication for an OSPF area. area area-idauthentication

zEnable MD5 authentication for an OSPF area.

area area-idauthentication message-digest

Page 8-4	August 1997
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