Brocade Communications Systems FastIron SX 800 Configuration Manual page 236

Configuring OSPF
FIGURE 22 OSPF network containing an NSSA
This example shows two routing domains, a RIP domain and an OSPF domain. The ASBR inside the NSSA imports external routes from
RIP into the NSSA as Type-7 LSAs, which the ASBR floods throughout the NSSA.
The ABR translates the Type-7 LSAs into Type-5 LSAs. If an area range is configured for the NSSA, the ABR also summarizes the
LSAs into an aggregate LSA before flooding the Type-5 LSAs into the backbone.
Since the NSSA is partially "stubby" the ABR does not flood external LSAs from the backbone into the NSSA. To provide access to the
rest of the Autonomous System (AS), the ABR generates a default Type-7 LSA into the NSSA.
Configuring an NSSA
To configure OSPF area 1.1.1.1 as an NSSA, enter the following commands.
device(config)# router ospf
device(config-ospf-router)# area 1.1.1.1 nssa 1
device(config-ospf-router)# write memory
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FastIron Ethernet Switch Layer 3 Routing
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