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 oods throughout the NSSA.
The ABR translates the Type-7 LSAs into Type-5 LSAs. If an area range is congured for the NSSA, the ABR also summarizes the
LSAs into an aggregate LSA before ooding the Type-5 LSAs into the backbone.
Since the NSSA is partially "stubby" the ABR does not ood 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.
Conguring an NSSA
To congure 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
Conguring OSPF
FastIron Ethernet Switch Layer 3 Routing
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