Configuring An Nssa Area; Configuring A Virtual Link - H3C S5800 Series Configuration Manual

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
Specify a cost for the default
route advertised to the NSSA
area
It is required to use the nssa command on all the routers attached to an NSSA area.
Using the default-cost command only takes effect on the ABR/ASBR of an NSSA area.

Configuring a Virtual Link

Non-backbone areas exchange routing information via the backbone area. Therefore, connectivity
between the backbone and non-backbone areas and within the backbone itself must be maintained.
If necessary physical links are not available for this connectivity maintenance, you can configure virtual
links to solve it.
Follow these steps to configure a virtual link:
To do...
Enter system view
Enter OSPF view
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 ] *
default-cost cost
Use the command...
system-view
ospf [ process-id | router-id
router-id | vpn-instance
instance-name ] *
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Remarks
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Required
Not configured by default.
Optional
Defaults to 1.
Remarks
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