From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Tue Jun 27 2006 - 01:27:00 ART
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_item09186a0080094704.shtml#q27
HTH
-- Petr Lapukhov, CCIE #16379 petr@internetworkexpert.comInternetwork 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 > > > > > > > > > > _______________________________________________________________________ > > > > Subscription information may be found at: > > > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > _______________________________________________________________________ > > > Subscription information may be found at: > > > http://www.groupstudy.com/list/CCIELab.html > > > > _______________________________________________________________________ > > Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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