From: Ramy Sisy (ramysisy@ipknowledgenet.com)
Date: Tue May 13 2008 - 08:11:01 ART
Hi Uyota,
STUB only allows LSA 1, 2, 3.
Totally STUBBY only allows LSA 1, 2 and ABR will inject default route to
STUB routers.
You have to use any of them if your area is the last resort OSPF area and
there are no more areas behind it.
NSSA only allows LSA 1, 2, 3, 7.
NSSA Totally STUBBY allows LSA 1, 2, 7 and ABR will inject default route to
NSSA routers.
You have to use any of them if your area is a connected area to other AS or
to other IGP routing protocol like RIP V2 or EIGRP and you need to stop LSA
5 and inject it as LSA 7 inside your OSPF domain.
-----------------------------------------------
Thanks,
Ramy Sisy
CCIE#17321 (Security), CCSI#30417
http://www.linkedin.com/in/RAMYSISY
CCIE Security Content Manager/ Technical Instructor
http://www.CCBOOTCAMP.com
-----------------------------------------------
"Any intelligent fool can make things bigger, more complex, and more
violent. It takes a touch of genius - and a lot of courage - to move in the
opposite direction" Albert Einstein
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Uyota Oyearone
Sent: Monday, May 12, 2008 10:19 PM
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.
***
These two solutions seems to be doing the same thing for me
***
*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
***
My question is when can you categorically use nssa over stub, or vice-versa?
Thanks
Uyota
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