From: Annu (annu_roopa@xxxxxxxxx)
Date: Fri Dec 21 2001 - 03:04:43 GMT-3
Mannan/Hans,
Mannan: i tried ur solution and it works.May be we
will not have such a scenario really in real world. I
tried having two OSPF process and Redistributing them.
External routes from one process (learnt thru RIP)
were redistributed into another process on a ABR.I
applied route maps to prevent redistribution feedback
and loops.
Hans:I tried two scenarios
1. NSSA ASBR/ABR on same box.
2. NSSA ABR and NSSA ABR on different boxes.
I ran across something while doing this WHICH IS MY
NEXT QUESTION/SCENARIO in my next mail.
I tried area range and summary address
combinations.What i have observed is as follows:
For area range to work it must be ABR(as expected) and
the range must be in the area specified in
command.Networks from different areas dont work.
For external routes and summary address the cmd must
be done on ASBR and the networks must be on locally
learnt on that box not learnt thru another ASBR/ABR
path.
Let me know if u find anything different.
Thanks for u answers and ideas.
Annu.
--- Mannan Venkatesan <mv70@lucent.com> wrote:
> Annu,
> I tired this but it is ugly (too many
> configurations).
>
> Configure 2nd ospf process on the ABR and
> redistribute between ospf
> processes. And summaries the route on the 2nd
> process. Now the 1st process
> will have both summarized route and individual
> routes as well. Then filter
> the individual routes on the downstream routers.
>
> Mannan
>
>
> ----- Original Message -----
> From: "Hans" <yyao@sympatico.ca>
> To: "Annu" <annu_roopa@yahoo.com>; "Bill Carter"
> <bcarter@family-net.net>
> Cc: <ccielab@groupstudy.com>
> Sent: Monday, December 17, 2001 1:56 PM
> Subject: Re: OSPF External Routes Summarization
>
>
> > Annu,
> >
> > According to RFC and Cisco's application, ospf
> LSA 5 is only summarable
> on
> > ASBR. LSA 5 also will flood to all other areas
> except total stubby, there
> is
> > almost no control over it.
> >
> > However, you can try to use NSSA ASBR to introduce
> the external routes and
> > NSSA ABR to sum it using area range. I did not
> have a chance to test it.
> > There might be problems with this method because
> area range might not work
> > with LSA 7.
> >
> > I will try it and let you know the result.
> >
> > Hans
> >
> >
> > ----- Original Message -----
> > From: "Annu" <annu_roopa@yahoo.com>
> > To: "Bill Carter" <bcarter@family-net.net>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Monday, December 17, 2001 11:25 AM
> > Subject: RE: OSPF External Routes Summarization
> >
> >
> > > Bill,
> > >
> > > I'm aware of this. Pl. go thro' my question
> > > completely.
> > > I want to summarise after having been
> redistributed.
> > >
> > > Anyway, thanx for ur reply.
> > >
> > > --- Bill Carter <bcarter@family-net.net> wrote:
> > > > On router10 under ospf summary-address x.x.x.x
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com
> > > > [mailto:nobody@groupstudy.com]On Behalf Of
> > > > Annu
> > > > Sent: Monday, December 17, 2001 9:43 AM
> > > > To: ccielab@groupstudy.com
> > > > Cc: annu_roopa@yahoo.com
> > > > Subject: OSPF External Routes Summarization
> > > >
> > > >
> > > > Group,
> > > >
> > > > Is there any way to Summarize External routes
> learnt
> > > > in OSPF on an ABR or any other router ? I know
> its
> > > > done only at ASBR. Here is what i want to do -
> > > >
> > > >
> > > > Area 1(R11)------R9-----R4------R10---(RIP)
> > > > area1 |<--area 0-->|
> > > >
> > > > I want the RIP routes with subnets to be
> summarized
> > > > at
> > > > R9 before going to R11 and its downstream
> routers.
> > > >
> > > > Is there any way at all or is it that I HAVE
> TO
> > > > SUMMARIZE AT R10 while redistributing with
> summary
> > > > address command.
> > > >
> > > >
> > > >
> > > > =====
> > > > Thanks in advance for ur time and replies.
> > > > Annu.
> > > >
> > > >
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