Stub Areas And Not-So-Stubby Areas - Juniper J2300 User Manual

Figure 65: OSPF Topology with a Virtual Link
Area 0.0.0.0
In the topology shown in Figure 65, a virtual link is established between area
and the backbone area through area
other areas is routed through area
appropriate area border router. All inbound traffic destined for area
routed to the backbone area and then through area

Stub Areas and Not-So-Stubby Areas

Figure 66 shows an AS across which many external routes are advertised.
If external routes make up a significant portion of a topology database, you
can suppress the advertisements in areas that do not have links outside the
network. By doing so, you can reduce the amount of memory the nodes use
to maintain the topology database and free it for other uses.
Virtual link
Area 0.0.0.2
Area 0.0.0.3
. All outbound traffic destined for
0.0.0.2
to the backbone area and then to the
0.0.0.2
.
0.0.0.2
Routing Overview
0.0.0.3
is
0.0.0.3
273
OSPF Overview