From: ahmed badr (eng.ahmedbadr@gmail.com)
Date: Wed May 21 2008 - 08:53:17 ART
In cisco CCIE Exam certification guide, the author recommends that if you
have discontiguous or partitioned area, you should link it by Virtual link.
this is to have the same LSA database in the area.
I LABed it without virtual links and it worked. *is this a MUST??*
Also the more important question is that: what if the discontiguous area is
area 0. i.e I have
area 0 ---->area 5 ----> area 0
should I connect area0s together using a virtual link?
I also LABed that and it worked ok without virtual links. *is this a MUST
too?*
2008/5/15 Ina&Laurean <ina.laurean@gmail.com>:
> Depending on IP address space on Area 5 you may experince problems if you
> want to summarize.
> A single summary route for Area 5 won't work if you don't link the two
> sections together.
>
> Laurean
>
>
>
> On Wed, May 14, 2008 at 9:31 PM, Miguel Trejo <mike.trejo@gmail.com>
> wrote:
>
>> The main reason behind this working with no problem is that LSA doesn't
>> carry out area information once they are injected as inter-area routes. So
>> when they reach the "other"area 5 that ABR doesn't care about the original
>> area this belonged to, only about the ABR that originated the route as the
>> routers inside the "other" area 5 only care that this ABR knows how to
>> reach
>> the remote networks. OSPF is alink state protocol only at area level, when
>> talking about routes to networks in other areas we rely on what the ABR
>> says, pretty much like distance vector.
>>
>>
>> On Sat, May 10, 2008 at 3:51 PM, ahmed badr <eng.ahmedbadr@gmail.com>
>> wrote:
>>
>> > ok I got it. thnx
>> >
>> >
>> >
>> > 2008/5/10 Ibrahim kabir <kebramccie@live.com>:
>> >
>> > > yeah jason i meant OI i.e inter-area routes. The terms keep confusing
>> me
>> > > inter(btween areas) and intra(within same) area.
>> > >
>> > > Kabir K Ibrahim
>> > > B.sc CCNA CCNP CCDP CCNP MCP
>> > > +2348036477283
>> > >
>> > >
>> > > > Date: Sat, 10 May 2008 08:23:43 -0600
>> > > > From: madsen.jason@gmail.com
>> > > > To: kebramccie@live.com
>> > > > Subject: Re: OSPF areas
>> > > > CC: eng.ahmedbadr@gmail.com; ccielab@groupstudy.com
>> > >
>> > > >
>> > > > correct, a virtual link doesn't seem appropriate here. Kebram, I
>> think
>> > > you
>> > > > meant that the discontiguous area 5s are seeing each other as
>> > inter-area
>> > > > routes and not intra-area routes, right? each area 5 should end up
>> > being
>> > > > it's own unique area unless a tunnel is used.
>> > > >
>> > > > Jason
>> > > >
>> > > > On Sat, May 10, 2008 at 6:15 AM, Ibrahim kabir <kebramccie@live.com
>> >
>> > > wrote:
>> > > >
>> > > > > Ahmed,
>> > > > >
>> > > > > neva thought about this type of design at all. bt i labbed it and
>> it
>> > > worked
>> > > > > without gre or virtual-links. The main thing to look out for is
>> that
>> > > each
>> > > > > area
>> > > > > should be connected to the backbone area (Area 0). and looking at
>> > your
>> > > > > diagram the condition is true. only that the discontigious area
>> 5's
>> > see
>> > > > > each
>> > > > > others routes as intra-area routes.
>> > > > > Lab it and see for urself.
>> > > > > cheers,
>> > > > > kebram
>> > > > >
>> > > > >
>> > > > > > Date: Sat, 10 May 2008 13:30:06 +0300> From:
>> > eng.ahmedbadr@gmail.com
>> > > >
>> > > > > To:
>> > > > > ccielab@groupstudy.com> Subject: OSPF areas> > Dears,> >
>> according
>> > to
>> > > the
>> > > > > diagram below, should I link area 5 in the two sides by any> mean
>> (eg
>> > > > > tunnel)
>> > > > > or it should work fine.> > > > Area5 Area0 Area5>
>> -------------------
>> > > > > ----------- ------------------> - - - - - -> - --R1-----------
>> > > > > R2------------R3------------R4-- -> - - - - - ->
>> -------------------
>> > > > > ----------- -------------------> > >
>> > > > >
>> > >
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