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1. no redistribution into a stub area (must use NSSA) 2. no default route automatically in a NSSA (only NSSA totally)… look for wording of the question… 3. stub, nssa, and totally nssa get a default type 3 automatically (check show ip ospf database) last I recall the default the ABR sends is a type 3. 3. NSSA has the 7-to-5 translator election…
Its all about wording IMHO… just remember there is no TYPE 5 LSA in a STUB… so if you redistribute anything in, the NSSA’s have type 7 to do this.
-Joe
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Uyota Oyearone Sent: Tuesday, May 13, 2008 1:19 AM To: Cisco certification Subject: ospf stub & NSSA
Hi guys,

I am not 100% comfortable distinguishing btw. when to use nssa or stub

Assuming R1 connection to the rest of the ospf domain is through R3. Since R1 does not need specific routing information to the rest of the network, it just needs to receive only a default route.

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These two solutions seems to be doing the same thing for me
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*Solution 1*

R3#
router ospf 1
area 5 nssa no-summary

R1#
area 5 nssa.

*Sol.2*

R3#
area 5 stub no-summary

R1#
area 5 stub

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My question is when can you categorically use nssa over stub, or vice-versa?

Thanks

Uyota