From: Serhat Aslan (serhatworks@gmail.com)
Date: Sun Aug 26 2007 - 16:29:57 ART
Hi Toh,
You can use area filter-list for LSA-3 or stub area solution that
you mentioned.
Serhat Aslan
On 8/26/07, Toh Soon, Lim <tohsoon28@gmail.com> wrote:
>
> Hi Shine,
>
> Noted with thanks.
>
> Is there a workaround to this? I mean, the ability to summarize inter-area
> routes on the ABR into another area using the "area range" command?
>
> In my case if R4 learns 1000 inter-area routes and only 10 intra-area
> routes, and all of them can be summarized by a single summary route, then
> only the 10 intra-area routes are suppressed from entering Area 4 while the
> 1000 inter-area routes will "leak" into Area 4. Maybe I can make Area 4 a
> totally stubby area since it's connected to only one ABR (R4).
>
> Kindly comment.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
> On 8/27/07, CCIE 19999 <ccie@iprimus.com.au> wrote:
> >
> > Lim,
> >
> > You are telling the router to summarise the routes originated from area
> > 0 in
> > the command. SO the router is doing exactly the same. It summarizes the
> > routes originated in Area 0.
> >
> > HTH,
> > Shine
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com ] On Behalf Of
> > Toh
> > Soon, Lim
> > Sent: Monday, 27 August 2007 12:35 AM
> > To: Serhat Aslan
> > Cc: Cisco certification
> > Subject: Re: OSPF "area range" command summarizes only intra-area
> > routes?
> >
> > Hi Serhat,
> >
> > I'm sorry I don't fully understand your points.
> >
> > Without any area summarization, routers in Area 4 will learn all the
> > 200.0.0.x/32 routes as inter-area routes.
> >
> > I want to summarize all these host routes so that routers in Area 4 only
> > see
> > 200.0.0.0/24. I did it on the ABR (R4) using the "area 0 range 200.0.0.0
> > 255.255.255.0" command.
> >
> > However, Area 4 still sees 200.0.0.9/32. Why? As far as R4 is concerned,
> > the
> > 200.0.0.9/32 is an inter-area route whereas the other 200.0.0.x/32 are
> > intra-area routes.
> >
> > Appreciate your further advice.
> >
> >
> > Thank you.
> >
> > B.Rgds,
> > Lim TS
> >
> >
> > On 8/26/07, Serhat Aslan <serhatworks@gmail.com> wrote:
> > >
> > > Hi Toh,
> > > You made a wrong summarization. The steps of the summarizations are:
> > > 0. The areas must be originated with the specified ABR. This means
> > > intra-area routes.
> > > 1. Choosing an Area, (the routes must be originated with the same
> > area)
> > > "area-range X"
> > > 2. Area Routes Aggregation, (IP subnet mask supernetting)
> > >
> > > You forgot to consider step1.
> > >
> > > Serhat Aslan
> > >
> > >
> > > On 8/26/07, Toh Soon, Lim < tohsoon28@gmail.com> wrote:
> > >
> > > > Hi Group,
> > > >
> > > > R4 is an ABR connected to Area 0 and Area 4. It learns the following
> > > > routes
> > > > in Area 0:
> > > >
> > > > Intra-area:
> > > > 200.0.0.2/32
> > > > 200.0.0.5/32
> > > > 200.0.0.6/32
> > > >
> > > > Inter-area:
> > > > 200.0.0.9/32
> > > >
> > > > I'm trying to summarize the above routes into Area 4, as follows:
> > > >
> > > > !
> > > > router ospf 1
> > > > area 0 range 200.0.0.0 255.255.255.0
> > > > !
> > > >
> > > > Routers in Area 4 see the summary address 200.0.0.0/24. All
> > component
> > > > routes
> > > > are suppressed except for 200.0.0.9/32 which "leaks" into Area 4.
> > E.g.
> > > >
> > > > O IA 200.0.0.9/32 [110/784] via 192.168.40.1, 00:21:02,
> > > > FastEthernet0/0
> > > > O IA 200.0.0.0/24 [110/2] via 192.168.40.1, 00:17:49,
> > > > FastEthernet0/0
> > > >
> > > >
> > > > I suspect the "area range" command only summarizes intra-area
> > routes.
> > > > Can
> > > > anyone clarify this? I might be missing something here.
> > > >
> > > >
> > > > Thank you.
> > > >
> > > > B.Rgds,
> > > > Lim TS
> > > >
> > > >
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