Configuring An Nssa Area - 3Com S7906E Configuration Manual

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...
Enter system view
Enter OSPF view
Enter area view
Configure the area as a stub
area
Specify a cost for the default
route advertised to the stub
area
It is required to use the stub command on routers attached to a stub area.
Using the default-cost command only takes effect on the ABR of a stub area.
The backbone area cannot be a (totally) stub area.
A (totally) stub area cannot have an ASBR because AS external routes cannot be distributed into
the stub area.
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...
Enter system view
Enter OSPF view
Enter area view
Configure the area as an
NSSA area
Use the command...
system-view
ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
area area-id
stub [ no-summary ]
default-cost cost
Use the command...
system-view
ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
area area-id
nssa
[ default-route-advertise |
no-import-route |
no-summary |
translate-always |
translator-stability-interval
value ] *
1-25
Remarks
—
—
—
Required
Not configured by default.
Optional
Defaults to 1.
Remarks
—
—
—
Required
Not configured by default.