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Nexus OS - OSPF Command

Posted on 2016-11-04
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Last Modified: 2016-11-06
I have Nexus 7K & it is running OSPF. One of the areas is the NSSA area & I have the below command for the OSPF NSSA area
What does this command represent in Nexus

  area 0.0.1.23 nssa no-summary default-information-originate
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Question by:SrikantRajeev
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Predrag earned 500 total points
ID: 41874157
area 0.0.1.23 nssa no-summary     <---- is configuring totaly nssa and it will advertise default route into area (if default route it is present in ABR's routing table)
default-information originate         <--- should advertise default route into area (if ABR does not have default route in its routing table)

So it looks like redundant
Default Summary Route


By defining an area as a NSSA totally stub area, the NSSA ABR generates a default summary route. As mentioned, if the NSSA area were not defined as totally stub, then a default summary route is not generated by NSSA ABR. This configuration generates a default summary route for a NSSA totally stub area.

    router ospf 1
     Area 1 nssa no-summary
However it will be two type of LSAs. The first default route will be type 3 LSA and the second one will be type 7 LSA. Type 3 is preferred, but type 7 will be created even if ABR does not have default route in it's routing table.

Cisco article - OSPF Not-So-Stubby Area (NSSA)
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by:SrikantRajeev
ID: 41876195
got it thanks
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by:SrikantRajeev
ID: 41876197
Got it
Thanks
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