3Com Switch 8800 Configuration Guide Chapter 19 OSPF Configuration
19-24
Table 19-27 Configure an OSPF virtual link
Operation Command
Create and configure a virtual
link
vlink-peer router-id [ hello seconds | retransmit
seconds | trans-delay seconds | dead seconds |
simple password | md5 keyid key ]*
Remove the created virtual link undo vlink-peer router-id
area-id and router-id have no default value. By default, hello timer is 10 seconds,
retransmit 5 seconds, trans-delay 1 second, and the dead 40 seconds.
19.2.21 Configuring Stub Area of OSPF Stub areas are some special areas, in which the ABRs do not propagate the learned
external routes of the AS.
The stub area is an optional configuration attribute, but not every area conforms to the
configuration condition. Generally, stub areas, located at the AS boundaries, are those
non-backbone areas with only one ABR. Even if this area has multiple ABRs, no virtual
links are established between these ABRs.
To ensure that the routes to the destinations outside the AS are still reachable, the ABR
in this area will generate a default route (0.0.0.0) and advertise it to the non-ABR
routers in the area.
Pay attention to the following items when configuring a stub area:
z The backbone area cannot be configured to be the stub area and the virtual link
cannot pass through the stub area.
z If you want to configure an area to be the stub area, then all the routers in this area
should be configured with this attribute.
z No ASBR can exist in a stub area. In other words, the external routes of the AS
cannot be propagated in the stub area.
Perform the following configuration in OSPF area view.