Router Id; Areas - Hirschmann MACH 4000 User Manual

OSPF
An AS uses an "Autonomous System Boundary Router" (ASBR) to connect
with the outside world. An ASBR understands multiple protocols and serves
as a gateway to routers outside the areas. An ASBR is able to transfer routes
from different protocols into the OSPF. This process is known as
redistribution.

7.1.2 Router ID

The router ID in the form of an IP address is used to uniquely identify every
router within an autonomous system. To improve the transparency, it is
necessary to manually configure the router ID of every OSPF router. Thus
there is no automatic function that selects the router ID from the IP interfaces
of the router.
enable
configure
router ospf
router-id 192.168.1.0
enable

7.1.3 Areas

Each area first forms its own database using the link states within the area.
The data exchange required for this remains within the area. Each area uses
an Area Border Router (ABR) to link to other areas. The routing information
is summarized as much as possible between the areas (route
summarization).
70
Switch to the Priviledged EXEC mode.
Switch to the Configuration mode.
Switch to the Router Configuration mode.
Assign Router-ID (e.g. 192.168.1.0).
Switch on OSPF globally.
7.1 OSPF-Topology
Routing L3P
Release 4.0 11/07