HP VPN Firewall Appliances Network Management Configuration Guide

391
Ste
p
Command Remarks
4. Configure the area as
a stub area.
stub
[ default-route-advertise-al
ways | no-summary ] *
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.
5. Specify a cost for the
default route
advertised to the stub
area.
default-cost cost
Optional.
The default cost is 1.
The default-cost command takes effect only on
the ABR of a stub area or totally stub area.
NOTE:
V
irtual 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:
Ste
p
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 |
no-import-route | no-summary |
translate-always |
translator-stability-interval value ] *
Not configured by default.
5. Specify a cost for
the default route
advertised to the
NSSA area.
default-cost cost
Optional.
The default cost is 1.
The default-cost command takes effect
only on the ABR/ASBR of an NSSA area
and a totally NSSA area.
NOTE:
V
irtual links cannot transit a stub area or totally stub areas.
Configuring a virtual link
Non-backbone areas exchange routing information via the backbone area. Connectivity between the
backbone and non-backbone areas and within the backbone must be available.