3com S7906E Manuel De Montage
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neither AS external routes nor inter-area routing information will be distributed into the area. All the
packets destined outside of the AS or area will be sent to the ABR for forwarding.
Follow these steps to configure OSPF areas:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter OSPF view
ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
router-id | vpn-instance
instance-name ] *
—
Enter area view
area area-id
—
Configure the area as a stub
area
area
stub [ no-summary ]
Required
Not configured by default.
Specify a cost for the default
route advertised to the stub
area
route advertised to the stub
area
default-cost cost
Optional
Defaults to 1.
z
It is required to use the stub command on routers attached to a stub area.
z
Using the default-cost command only takes effect on the ABR of a stub area.
z
The backbone area cannot be a (totally) stub area.
z
A (totally) stub area cannot have an ASBR because AS external routes cannot be distributed into
the stub area.
z
Virtual links cannot transit (totally) stub areas.
Configuring an NSSA Area
A stub area cannot redistribute routes. You can configure the area as an NSSA area to allow for route
redistribution while keeping other characteristics of a stub area.
Follow these steps to configure an NSSA area:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter OSPF view
ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
router-id | vpn-instance
instance-name ] *
—
Enter area view
area area-id
—
Configure the area as an
NSSA area
NSSA area
nssa
[ default-route-advertise |
no-import-route |
no-summary |
translate-always |
translator-stability-interval
value ] *
[ default-route-advertise |
no-import-route |
no-summary |
translate-always |
translator-stability-interval
value ] *
Required
Not configured by default.