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Configuring the Open Shortest Path First Protocol
20-37
20
Information option. However, an NSSA is different from a stub, because when the
router is an ASBR, it can import a default external AS route (for routing protocol
domains adjacent to the NSSA but not within the OSPF AS) into the NSSA using
this option.
• No Redistribution – Use this option when the router is an NSSA Area Border
Router (ABR) and routes only need to be imported into normal areas (page 20-35),
but not into the NSSA. In other words, redistribution should be disabled to prevent
the NSSA ABR from advertising external routing information (learned through
routers in other areas) into the NSSA. (Default: Enabled)
Note:
This router supports up 16 areas, either normal transit areas, stubs, or NSSAs.
Web - Click Routing Protocol, OSPF, NSSA Settings. Create a new NSSA or modify
the routing behavior for an existing NSSA, and click Apply.
Figure 20-15 OSPF NSSA Settings
CLI - This example configures area 0.0.0.1 as a stub and sets the cost for the default
summary route to 10.
Console(config-router)#area 0.0.0.1 nssa
default-information originate 42-21
Console(config-router)#area 0.0.0.2 nssa no-redistribution 42-28
Console(config-router)#