|
In the figure, Area 3 does not have a
direct physical connection to the backbone (Area 0), which is an
OSPF requirement because the backbone is a collection point for LSAs.
ABRs forward summary LSAs to the backbone, which in turn forwards
the traffic to all areas. All interarea traffic transits the
backbone.
To provide connectivity to the
backbone, a virtual link must be configured between R2 and R1. Area
1 will be the transit area and R1 will be the entry point into area
0. R2 will have a logical connection to the backbone through the
transit area.
Both sides of the virtual link must
be configured, as follows:
- R2(config-router)#area 1
virtual-link 10.3.10.5 --- With this command, area 1 is defined
to be the transit area and the router ID of the other side of
the virtual link is configured.
- R1(config-router)#area 1
virtual-link 10.7.20.123 --- With this command, area 1 is
defined to be the transit area and the router ID of the other
side of the virtual link is configured.
 |
 |
Interactive
Lab Activity
(Flash,
360 kB) |
| |
The
purpose of this activity is to configure an OSPF
virtual link so that the disconnected Area 3 can
reach the backbone Area 0, as required by OSPF.
Although
Multi-Area OSPF has already been configured, you
will configure a virtual link through Area 51
connecting Area 3 to the backbone Area 0. |
|
|
|
|