Configuring Not-So-Stubby Areas (Nssa); Enabling Authentication - HP procurve 8100fl series Management And Configuration Manual

OSPF Configuration
Configuring OSPF Router Parameters
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ProCurve(config-ospf-area)#stubhost <ipaddr> cost
<costvalue>
To specify the cost to inject into a stub area:
ProCurve(config-ospf-area)#default-cost <num>
To use a prefix-list to filter specific summary LSAs from a stub area, enter the
following command:
ProCurve(config-ospf-area)#summary-filter <prefix>

Configuring Not-So-Stubby Areas (NSSA)

NSSAs are similar to stub areas, in that they are used to restrict the AS-external
routing for routers in the area. But unlike stub areas, NSSAs can originate and
advertise Type-7 LSAs. Type-7 LSAs carry external route information which
allow external routing within an NSSA.
Type 7 LSAs are advertised only within a single NSSA; they are not flooded
into the backbone area or any other area by border routers. NSSA border
routers translate Type-7 LSAs into Type-5 LSAs and flood them to all Type-5
capable areas. However, the switch supports the configuration of NSSAs and
the ability to add networks to an NSSA.
To define an area as an NSSA, enter the following command:
ProCurve(config-ospf-area)#nssa

Enabling Authentication

The ProCurve 8100fl supports message-digest authentication for OSPF areas.
To enable message-digest authentication for an area, enter:
ProCurve(config-ospf-area)#authentication
[message-digest]
Note that you specify the actual keys to be used for authentication at the
interface level.