[j-nsp] OSPF NSSA Type 4 LSA generation behavior

[Muruganandham M]

Dear Experts,

        As per RFC 3101, *The OSPF Not-So-Stubby Area (NSSA) Option*, listed
in the Juniper supported standards,

Since Type-5 AS-external-LSAs are not flooded
   into NSSAs, NSSA border routers should not originate Type-4 summary-
   LSAs into their NSSAs.  Also an NSSA's border routers never originate
   Type-4 summary-LSAs for the NSSA's AS boundary routers, since Type-7
   AS-external-LSAs are never flooded beyond the NSSA's border.

This looks to be the same behavior in CISCO also.

But JUNIPER router (ABR) does generate the ASBR summary (type 4) for
the NSSA ASBR.  Is there any specific  reason for doing this
implementation? Or Juniper follows any other RFC for this behavior?

-- 
Thanks
Muruganandham M