Routing
RM Web L3E
Release
6.0
07/2010
6.3
ARP
143
OSPF Router
OSPF distinguishes between the following router types:
X Internal Router:
All OSPF interfaces of an internal router are within the same area.
X Area Border Router (ABR):
ABRs have OSPF interfaces in a number of areas, including the
backbone area. ABRs thus participate in multiple areas. Where
possible, you summarize a number of routes and send “Summary
LSAs” to the backbone area.
X Autonomous System Area Border Router (ASBR):
An ASBR is located on the boundary of an autonomous system and
links OSPF to other autonomous systems / routing protocols. These
external routes are transferred into OSPF using what is known as
redistributing and are then summarized as “AS-external LSAs” and
flooded into the area.
Switch on the redistributing explicitly.
If you want to use subnetting, then you enter this explicitly. In OSPF,
the following “routing protocols” can be exported:
X connected (local subnetworks on which OSPF is not switched on),
X static (static routes),
X RIP.
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