Configuring An Nssa Area - HP MSR Series Configuration Manual

flooded within the stub area. The ABR generates a default route into the stub area so all packets destined
outside of the AS are sent through the default route.
To further reduce the routing table size and routing information exchanged in the stub area, you can
configure it as a totally stub area by using the stub no-summary command on the ABR. AS external
routes and inter-area routes are not distributed into the area. All the packets destined outside of the area
are sent to the ABR for forwarding.
To configure an OSPF stub area:
Step
1. Enter system view.
2. Enter OSPF view.
3. Enter area view.
4. Configure the area as a stub
area.
5. Specify a cost for the default
route advertised to the stub
area.
NOTE:
Virtual links cannot transit 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 keeping other stub area characteristics.
To configure an NSSA area, issue the nssa command on all the routers attached to the area. To configure
a totally NSSA area, you also need to 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:
Step
1. Enter system view.
2. Enter OSPF view.
Command
system-view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ]
*
area area-id
stub
[ default-route-advertise-always |
no-summary ] *
default-cost cost
Command
system-view
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
64
Remarks
N/A
N/A
N/A
Not configured by default.
You cannot configure the
backbone area as a stub or totally
stub area.
A stub or totally stub area cannot
have an ASBR because external
routes cannot be distributed into
the area.
Optional.
The default cost is 1.
The default-cost command takes
effect only on the ABR of a stub
area or totally stub area.
Remarks
N/A
N/A