Figure 8: Nssa; Figure 9: Nssa Configuration Example - Avaya 8600 Engineering

Step 4 Enable OSPF
ip ospf router-id 1.1.1.2
ip ospf enable
ip ospf area 0.0.0.2 create
ip ospf area 0.0.0.2 stub true
ip ospf interface 10.1.1.17 area 0.0.0.2
NSSA

A not so stubby area (NSSA) also prevents the flooding of AS-External Link State advertisements
into the area by replacing them with a default route. The added feature of NSSA is the ability to
import small stub (non-OSPF) routing domains into OSPF. This allows the NSSA to import
external routes such as RIP routes and then advertise these routes throughout the network.
External routing information is imported into a NSSA by using Type-7 LSAs. These LSA‟s are
translated at the NSSA boundary into LSA Type-5. The N/P bit in the Type-7 LSA Options field
indicates whether the Type-7 LSA should be translated. Only those LSA‟s with the N/P-bit set are
translated.
8.2.2.1.2 Configuration Example – Configuring an NSSA Area
November 2010

Figure 8: NSSA

Figure 9: NSSA Configuration Example

ERS 8600 / 8800 OSPF Technical Configuration Guide
These commands configure the PP8600 as stub border
router. Note by default, OSPF interface 10.1.1.22 is by
default put into OSPF area 0.0.0.0. Since we added one
additional sub area of 0.0.0.2, PP8600B automatically
becomes an stub ABR.
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