ZyXEL Communications 310 User Manual page 203

• An Autonomous System Boundary Router (ASBR) exchanges routing information with routers in
networks outside the OSPF AS. This is called redistribution in OSPF.
Table 74 OSPF: Redistribution from Other Sources to Each Type of Area
SOURCE \ TYPE OF AREA
Static routes
RIP
• A backbone router (BR) has at least one interface with area 0. By default, every router in area 0
is a backbone router, and so is every ABR.
Each type of router is illustrated in the following example.
Figure 116 OSPF: Types of Routers
In order to reduce the amount of traffic between routers, a group of routers that are directly
connected to each other selects a designated router (DR) and a backup designated router (BDR).
All of the routers only exchange information with the DR and the BDR, instead of exchanging
information with all of the other routers in the group. The DR and BDR are selected by priority; if
two routers have the same priority, the highest router ID is used.
The DR and BDR are selected in each group of routers that are directly connected to each other. If
a router is directly connected to several groups, it might be a DR in one group, a BDR in another
group, and neither in a third group all at the same time.
Virtual Links
In some OSPF AS, it is not possible for an area to be directly connected to the backbone. In this
case, you can create a virtual link through an intermediate area to logically connect the area to the
backbone. This is illustrated in the following example.
ZyWALL 110/310/1100 Series User's Guide
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Chapter 10 Routing Protocols
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