Ospf-Topology; Autonomous System - Hirschmann MACH 4000 User Manual

OSPF

7.1 OSPF-Topology

7.1 OSPF-Topology
OSPF is hierarchically structured in order to limit the scope of the OSPF
information to be exchanged in large networks. You divide up your network
using what are known as areas.

7.1.1 Autonomous System

An Autonomous System (AS) is a number of routers that are managed by a
single administration and use the same Interior Gateway Protocol (IGP).
Exterior Gateway Protocols (EGP), on the other hand, are used to connect a
number of autonomous systems. OSPF is an Interior Gateway Protocol.
Autonomous System
Area 2
Area 1
ASBR
ABR
ABR
Backbone Area 0
RIP
Figure 25: Autonomous System
Routing L3P
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Release 4.0 11/07