Because ASBRs within an NSSA are not advertised outside the NSSA via ASBR 
summaries (type 4). 
Hope this helps,
Acee
On Dec 29, 2010, at 5:20 AM, p6 c6d6 wrote:

> hi,
> 
> nssa rfc states that the forwarding address for a 
> type-7 lsa is mandatory if it is to be translated to
> a type-5 lsa. why is this a mandatory. why not
> forwarding address is optional like type-5 lsas.
> is there any specific reason ?
> 
> thanks
> 
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