I'll add that an ASBR that is also an ABR would normally not set the P-bit 
since it would advertise AS External LSAs into the backbone. 
Thanks,
Acee

On Jan 12, 2011, at 8:32 AM, Pat Murphy - (650)329-4044 wrote:

> Setting the p-bit is done by configuration. Ideally, when external routes are 
> imported 
> into an NSSA, a prefix match based on a configured ACL triggers a configured 
> set 
> operation that either clears or sets the p-bit. The exact tools for setting 
> the p-bit 
> are implementation dependent. Consult your implementation documentation for 
> specifics. 
> 
> Pat
> 
> Date: Tue, 11 Jan 2011 18:24:04 +0530
> From: p6 c6d6 <[email protected]>
> Subject: [OSPF] p bit setting
> Sender: [email protected]
> To: [email protected]
> Errors-to: [email protected]
> 
> hi,
> 
> how does an nssa asbr determines whether to set p bit or not.
> 
> thanks
> 
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