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AI2524 Router Card User’s Manual
Page 8-4 August 1997
2524UM
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:
z
Priority for a neighboring route
z
Nonbroadcast poll interval
z
Interface 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-summary
on 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:
z
Enable authentication for an OSPF area.
area area-id authentication
z
Enable MD5 authentication for an OSPF area.
area area-id authentication message-digest