3com S7906E Manuel De Montage

 

1-24 

Configure a description for 
the OSPF process  

description description 

Optional 

Not configured by default. 

Configure an OSPF area and 
enter OSPF area view 

area area-id 

Required 

Not configured by default. 

Configure a description for 
the area 

description description 

Optional 

Not configured by default. 

Specify a network to enable 
OSPF on the interface 
attached to the network 

network ip-address 
wildcard-mask 

Required 

Not configured by default. 

 

z 

A network segment can only belong to one area. 

z 

It is recommended to configure a description for each OSPF process to help identify purposes of 

processes and for ease of management and memorization.  

z 

It is recommended to configure a description for each area to help identify purposes of areas and 

for ease of management and memorization. 

 

After splitting an OSPF AS into multiple areas, you can further configure some areas as stub areas or 

NSSA areas as needed.  

If connectivity between the backbone and a non-backbone area or within the backbone itself cannot be 

achieved, you can configure virtual links to solve it. 

Before configuring an OSPF area, you have configured: 

z 

IP addresses for interfaces, making neighboring nodes accessible with each other at the network 

layer. 

z 

OSPF basic functions. 

You can configure a non-backbone area at the AS edge as a stub area by configuring the stub 

command on all the routers attached to the area. In this way, Type-5 LSAs, which describe AS external 

routes, will not be flooded within the stub area, reducing the routing table size. The ABR generates a 

default route into the stub area so that all packets destined outside of the AS are sent through the 

default route. 

To further reduce the routing table size and routing information exchanged in the stub area, you can 

configure it as a totally stub area by using the stub [ no-summary ] command on the ABR. In this way,