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Ste
Command
Remarks
5. (Optional.) Specify a cost
for the default route
advertised to the stub area.
default-cost cost
The default setting is 1.
The default-cost cost command takes
effect only on the ABR of a stub area or
totally stub area.
Configuring an NSSA area
A stub area cannot import external routes, but an NSSA area can import external routes into the OSPF
routing domain while retaining other stub area characteristics.
Do not configure the backbone area as an NSSA area or totally NSSA area.
To configure an NSSA area, configure the nssa command on all the routers attached to the area.
To configure a totally NSSA area, configure the nssa command on all the routers attached to the area
and configure the nssa no-summary command on the ABR. The ABR of a totally NSSA area does not
advertise inter-area routes into the area.
To configure an NSSA area:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
3. Enter area view.
area area-id
N/A
4. Configure the area as an
NSSA area.
nssa [ default-route-advertise
[ cost cost | nssa-only |
route-policy route-policy-name |
type type ] * | no-import-route |
no-summary | suppress-fa |
[ translate-always |
translate-never ] |
translator-stability-interval value ]
*
By default, no area is configured as
an NSSA area.
5. (Optional.) Specify a cost for
the default route advertised
to the NSSA area.
default-cost cost
The default setting is 1.
This command takes effect only on
the ABR/ASBR of an NSSA or totally
NSSA area.
Configuring a virtual link
Virtual links are configured for connecting backbone area routers that have no direct physical links.
To configure a virtual link:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
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