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OSPF nssa-only question

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I am slight confused by the default behaviour of OSPF when it comes to setting the on an Type7 LSA. My understanding is that when the P bit is set then the LSA7 can be translated back to LSA5 by any other ABR's further upstream. However in some videos I have watched I have seen it both set and turned off in examples where the NSSA-ONLY command hasnt been applied. So the question is -> Is the default behaviour to set P bit and allow LSA7 to LSA5 re-advertisement, or is the default behaviour to turn this off so that LSA7 cant be translated back to LSA5 to prevent loops?

 

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