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Step Command Remarks
5. Enable an OSPFv3 process
on the interface.
ospfv3
process-id
area
area-id
[
instance
instance-id ]
No OSPFv3 process is enabled
on an interface by default.
Configuring OSPFv3 area parameters
OSPFv3 has the same stub area, NSSA area, and virtual link features as OSPFv2.
After you split an OSPFv3 AS into multiple areas, the LSA number is reduced and OSPFv3
applications are extended. To further reduce the size of routing tables and the number of LSAs,
configure the non-backbone areas at an AS edge as stub areas.
A stub area cannot import external routes, but an NSSA area can import external routes into the
OSPFv3 routing domain while retaining other stub area characteristics.
Non-backbone areas exchange routing information through the backbone area, so the backbone
and non-backbone areas (including the backbone itself) must be fully meshed. If no connectivity can
be achieved, configure virtual links.
Configuration prerequisites
Before you configure OSPFv3 area parameters, enable OSPFv3.
Configuring a stub area
All the routers attached to a stub area must be configured with the stub command. The
no-summary keyword is only available on the ABR of the stub area.
If you use the stub command with the no-summary keyword on an ABR, the ABR advertises a
default route in an Inter-Area-Prefix LSA into the stub area. No AS External LSA, Inter-Area-Prefix
LSA, or other Inter-Area-Router LSA is advertised in the area. The stub area of this kind is called a
totally stub area.
To configure an OSPFv3 stub area:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter OSPFv3 view.
ospfv3
[ process-id |
vpn-instance
vpn-instance-name ] *
N/A
3. Enter OSPFv3 area view.
area
area-id
N/A
4. Configure the area as a stub
area.
stub
[
default-route-advertise-always
|
no-summary
] *
By default, no area is configured
as a stub area.
5. (Optional.) Specify a cost for
the default route advertised
to the stub area.
default-cost
value The default setting is 1.
Configuring an NSSA area
To configure an NSSA area, configure the nssa command on all the routers attached to the area.
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