Cisco Systems 78-11741-02 IPC-386, are advertised by OSPF., In this configuration, five routers are configured in OSPF autonomous system 1:, to S0., configuration commands specify the same area (area 0, or the backbone area).

Configuring IP Routing Protocol-Independent Features
IP Routing Protocol-Independent Configuration Examples
IPC-386
Cisco IOS IP Configuration Guide
Figure63 Example OSPF Autonomous System Network Map
In this configuration, five routers are configured in OSPF autonomous system 1:
•Router A and Router B are both internal routers within area 1.
•Router C is an OSPF ABR. Note that for Router C, area 1 is assigned to E3 and Area0 is assigned
to S0.
•Router D is an internal router in area 0 (backbone area). In this case, both network router
configuration commands specify the same area (area 0, or the backbone area).
•Router E is an OSPF ASBR. Note that BGP routes are redistributed into OSPF and that these routes
are advertised by OSPF.
E1 E2
E3
E5
S2
S1
E4
Interface address:
192.168.1.1
Interface address:
192.168.1.2
Interface address:
192.168.1.3
Network: 192.168.1.0
Network: 192.168.2.0
Network: 10.0.0.0
Interface address:
10.0.0.4
Interface address:
172.16.1.5
Interface address:
10.0.0.5
Network: 172.16.1.0
Remote address:
172.16.1.6
in autonomous
system 60000
Area 1
Area 0
OSPF domain (BGP autonomous system 50000)
S1030a
Interface address:
192.168.2.4
S0 Interface address:
192.168.2.3
Router E
Router D
Router C
Router BRouter A