From: Elias Chari (elias.chari@gmail.com)
Date: Fri Nov 10 2006 - 22:33:17 ART
Hi Michael,
Look at the requirement (assuming the ccie lab) and decide what area
type you need. If the task has some restrictions on the type of routes an
area should receive, the objective may be met by both stub or nssa, but
then you may be asked (towards the end of your ospf section..-) to
redistribute a connected interface, static route(s) or another protocol from
within that area.
Remember the main difference between stub and nssa. NSSA supports an ASBR,
whilst stub areas do not. Now ask yourself what area type will it meet the
above objectives?
HTH
Elias
On 11/11/06, Michael Zuo <mzuo@ixiacom.com> wrote:
>
> Hi Guys, thanks for the replies.
>
>
>
> Unfortunately, I am getting more confused :-) sorry about being so slow.
>
>
>
> If I configure "area 1 stub no-summary", the area will only have type 1,
> 2 LSA plus one type 3 default route
>
>
>
> If I configure "area 1 nssa no-summary no-redistribution", "no-summary"
> will block out type 3 LSA except one default route. "no-redistribution"
> will block out type 7 LSA. What is left is type 1, 2 and one type 3
> default route.
>
>
>
> As this point two command will yield the same types of LSAs, wouldn't
> they be equivalent?
>
>
>
> thanks
>
>
>
> ________________________________
>
> From: Ian Blaney [mailto: ian.blaney@gmail.com]
> Sent: Friday, November 10, 2006 1:22 AM
> To: Michael Zuo
> Cc: ccielab@groupstudy.com
> Subject: Re: difference between two OSPF area types
>
>
>
> Michael
>
> When an ABR is also an ASBR and is connected to a NSSA the default
> behavior is to send redistributed
> routes into the NSSA.
>
> With the no-redistribution option redistribution will be turned off on
> the ABR/ASBR into the NSSA. The no-summary will send a type 3 default
> route into the NSSA and block the flooding of type 3 and type 4 LSAs
> into the NSSA
>
> I hope the diagram below is readable. R1 is an ABR for the OSPF NSSA
> area and also an ASBR for the redistributed RIP routes from R2. The
> no-redistribution option will prevent the redistributed RIP routes being
> advertised into the OSPF NSSA area.
>
> OSPF
> R1 NSSA R3
>
> RIP
>
> R2
>
> Ian
>
> On 11/10/06, Michael Zuo < mzuo@ixiacom.com > wrote:
>
> Hi Group,
>
>
>
> Anyone knows the difference between:
>
>
>
> Area 1 nssa no-summary no-redistribution
>
>
>
> And
>
>
>
> Area 1 stub no-summary
>
>
>
>
>
> To me, they seem to be the same thing...
>
>
>
>
>
> thanks
>
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