Levelone GTL-2690 User Manual download pdf (Page 378)

100

101

Configuring the Open Shortest Path First Protocol

20-37

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)#

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Levelone GTL-2690 User Manual Page 378

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