From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Mon Jan 07 2002 - 21:50:05 GMT-3
First of all we know that to rdistribute to RIP or IGRP, the subnet mask
must be the same for the same classful network address. All you have to
do is to ensure those
subnet you want to redistribute has the same subnet mask, there are
serveral ways:-
The easy way is create a static route and redistribute, but what if it
is not allow, then you have to think about other way.
If your VLSM route is from OSPF, in theory,
- area xx range only work between areas., ie you need area 0 (backbone)
- Summary address work if you redistribute from other routing protocol
into ospf
and then redistribute to another routing protocol.
One of the problem is that require you to think is ospf is running on
non area 0 and you need to redistribute the network in this router.
- If this is a abr, no problem.
- If this is a non abr, you have problem, this problem has also discuss
before in this groupstudy.One approach is to create another OSPF
process, redistribute subnet that from this router to the new OSPF
process, summary address in this new process
(now it is a asbr as well). now you can redistribute from this new
process into the
classful routing process.
The other problem is that you have a single area ospf and you have to
redistribute
to other routing protocol(RIP or IGRP).
- For this case, it has discuss before, for IOS 12.1, you can create a
area and use
area range to summarization.
Parry Chua
-----Original Message-----
From: Bhisham Bajaj [mailto:bhishambajaj@yahoo.com]
Sent: Tuesday, January 08, 2002 2:32 AM
To: kenairs; Chua, Parry; Joe Hsieh; ccielab@groupstudy.com
Subject: Re: OSPF inter-area summarization
I know we have to make it work but how
Can u please explain me how on earth is it possible to
redistribute ospf into rip
Without using a static route and redistributing static
Thanks
Bhisham
--- kenairs <kenairs@hotmail.com> wrote:
> Hi ,
> If the null summary route is created by the area
> range command , what is the
> impact ?
> I don't see any thing that are harmed by the summary
> route , in my case..
>
> Am i correct ?
>
> ----- Original Message -----
> From: Chua, Parry <Parry.Chua@compaq.com>
> To: Joe Hsieh <joe.hsieh@networkplus.com>;
> <ccielab@groupstudy.com>
> Sent: Monday, January 07, 2002 11:34 AM
> Subject: RE: OSPF inter-area summarization
>
>
> > I have test on 12.1(9),
> > If area xx range is done at abr, it will
> automaticlly create a null
> > summary route.
> > If it is done at internal router (include area 0),
> no null summary route
> > in routing table.
> >
> > Parry Chua
> >
> > -----Original Message-----
> > From: Joe Hsieh [mailto:joe.hsieh@networkplus.com]
> > Sent: Monday, January 07, 2002 11:17 AM
> > To: ccielab@groupstudy.com
> > Subject: OSPF inter-area summarization
> >
> >
> > Hi,
> >
> > There is a question about OSPF inter-area
> summarization. In Doyle's
> > book,
> > he keep mentions that inter-area summarization
> does not automatically
> > create
> > a null summary route. But, in my experience, it
> does.
> >
> > Anybody knows if it is because the ver of
> IOS(12.1.11 is the earliest on
> > routers I can use) or something else?
> >
> > Thanks,
> >
> > Hsieh
>
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