From: Arun Arumuganainar (aarumuga@hotmail.com)
Date: Tue Jun 27 2006 - 11:09:03 ART
Cool ... This explains perfectly .
It mean there is no workaround when you configured ABR and ASBR on a
different router.
Thanks for confirming the same .
Thanks and Regards
Arun
----- Original Message -----
From: "Petr Lapukhov" <petr@internetworkexpert.com>
To: "Emir trhulj" <skimad@gmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, June 27, 2006 9:57 AM
Subject: Re: Disabling Type-7 to type-5 conversion
> Yeah,
>
> two good references at this point:
>
> 1) OSPF NSSA Area RFC:
>
> http://www.rfc-archive.org/getrfc.php?rfc=1587
>
> 2) Cisco IOS behavior with respect to P-bit
>
>
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094
704.shtml#q27
>
> HTH
>
> --
> Petr Lapukhov, CCIE #16379
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
> 2006/6/27, Emir trhulj <skimad@gmail.com>:
> >
> > This discussion led me to think about this a little.Here is bit more
info
> > on
> > this topic I found.
> >
> >
> >
> > -
> >
> > Bit P - This bit is used to tell the NSSA ABR whether to translate
> > type 7 into type 5.
> > -
> >
> > No Type 7/5 translation means bit P = 0.
> > -
> >
> > Type 7/5 translation means bit P = 1.
> > -
> >
> > If bit P = 0, then the NSSA ABR must not translate this LSA into Type
> > 5. This happens when NSSA ASBR is also an NSSA ABR.
> > -
> >
> > If bit P = 1, then the NSSA ABR (if there are multiple NSSA ABRs, the
> > one with highest router ID) must translate this type 7 LSA into a
type
> > 5
> > LSA."
> >
> >
> >
> > On 6/27/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
> > >
> > > Absolutely correct.
> > >
> > > AFAIK Cisco IOS offers no way of "manual" P-bit clearing, it's always
> > set.
> > >
> > > Two known wokrarounds for this issue are "summary..not-advertise"
> > > and "area x nssa no-redistribution". Basically, result is the same,
> > > as with P-bit reset, so it's merely a theoretical qurestion... ;)
> > >
> > > HTH
> > > --
> > > Petr Lapukhov, CCIE #16379
> > > petr@internetworkexpert.com
> > >
> > > Internetwork Expert, Inc.
> > > http://www.InternetworkExpert.com
> > > Toll Free: 877-224-8987
> > > Outside US: 775-826-4344
> > >
> > > 2006/6/26, Narbik Kocharians <narbikk@gmail.com>:
> > > >
> > > > The summary-address command does NOT stop the router from converting
> > the
> > > > type 7 to type 5, it stops the router from advertising them.
> > > >
> > > > Narbik Kockarians
> > > > CCIE# 12410 (R&S, SP, Security)
> > > > CCSI# 30832
> > > > Network Learning, Inc. (CCIE class Instructor)
> > > > www.ccbootcamp.com (CCIE Training)
> > > >
> > > >
> > > >
> > > > On 6/25/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
> > > > >
> > > > > Arun,
> > > > >
> > > > > use "summary-address x.x.x.x y.y.y.y not-advertise" at *ABR* to
> > > > > prevent 7->5 conversion.
> > > > >
> > > > > 2006/6/25, Arun Arumuganainar <aarumuga@hotmail.com>:
> > > > > >
> > > > > > Hi ,
> > > > > >
> > > > > > Is there any way by which we can disable type 7 to type5
> > conversion.
> > > > > >
> > > > > > Thanks and Regards
> > > > > > Arun
> > > > > >
> > > > > >
> > > >
> > _______________________________________________________________________
> > > > > > Subscription information may be found at:
> > > > > > http://www.groupstudy.com/list/CCIELab.html
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Petr Lapukhov, CCIE #16379
> > > > > petr@internetworkexpert.com
> > > > >
> > > > > Internetwork Expert, Inc.
> > > > > http://www.InternetworkExpert.com
> > > > > Toll Free: 877-224-8987
> > > > > Outside US: 775-826-4344
> > > > >
> > > > >
> > >
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