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DES-7200 Configuration Guide Chapter 5 OSPF
Configuration
5-9
Caution
After configured an area as the stub area, you can configure the default-cost
parameter. If this area is changed as an ordinary area, the default-cost
configuration will be deleted automatically.
5.2.4 Configuring OSPFv3 Virtual Link
In the OSPF, all areas must connect to the backbone area to ensure the
communication with other areas.If some areas cannot connect to the backbone
area, they must use virtual links to connect the backbone area.
To establish a virtual link, execute the following command in the OSPFv3
configuration mode:
Command Function
area area-id virtual-link router-id [hello-interval
seconds] [dead-interval seconds] [transmit-delay
seconds] [retransmit-interval seconds] [instance
instance-id]
Configure a virtual link. By
default, the virtual link is not
configured.
area-id: the ID for the area
where the virtual link is.
router-id: the router-id for the
virtual link neighbor.
Other parameters are the same
as the interface parameters.
To remove the configuration, use the no form of the above commands.
Caution
1. It is not allowed to create a virtual link in the stub area and NSSA.
2. A virtual link can be taken as a special interface, so its configuration is
same to that of a normal interface. You must ensure that the configurations of
instance, hello-interval and dead-interval configured at the two ends of the
virtual link are identical.
5.2.5 Configuring OSPFv3 Route Aggregation
Without route aggregation, every device in a network must maintain the routeing
information of the whole network. By aggrgating some information together, route
aggregation can alleviate the burden on the L3 equipment and network bandwidth.
As the size of a network is growing, route aggregation becomes more and more
important.