From: Peter van Oene (pvo@xxxxxxxxxxxx)
Date: Mon Aug 05 2002 - 14:02:55 GMT-3
both of you are making the same point. If a router is an NSSA ASBR and ABR,
it has the choice of advertising externals into both, or one of the
connected areas (in theory) This command is simply allowing this external
information to be shield from the stub area if you desire it to be which is
the point both of you seem to have made.
At 09:36 AM 8/5/2002 -0700, ying c wrote:
>Hi,
>
>That's not what it said in
>
>http://www.cisco.com/warp/public/104/nssa.html
>
>Below is from the web page's Filtering in NSSA
>section:
>
>
>"There are situations where there is no need to inject
>external routes into the NSSA as type 7. This
>situation usually occurs when an ASBR is
>also an NSSA ABR. When redistribution takes place in
>this scenario, the router generates type 5 as well as
>type 7 LSAs. You can prevent the
>router from creating type 7 LSAs for NSSA using the
>following command:
>
> router ospf 1
> area 1 nssa no-redistribution
>
>In the network diagram above, area 1 is configured
>using the no-redistribution option. This means that
>all IGRP routes are redistributed into
>area 0, but no type 7 LSAs are generated for area 1.
>Only configure this command on an NSSA ASBR that's
>also an ABR."
>
>Chang
>
>--- "Volkov, Dmitry (Toronto - BCE)"
><dmitry_volkov@ca.ml.com> wrote:
> >
> > Hi,
> >
> > "no-redistribution" will not sent lsa 5 into nssa.
> > ABR/ASBR will sent only lsa 5 to area 0.
> >
> > Dmitry
> >
> > -----Original Message-----
> > From: ying c [mailto:bf5tgh1@yahoo.com]
> > Sent: Sunday, August 04, 2002 10:59 PM
> > To: Jaspreet Bhatia; ccielab@groupstudy.com
> > Subject: Re: NSSA Type 7 to Type 5 question
> >
> >
> > Hi,
> >
> > See this page:
> >
> > http://www.cisco.com/warp/public/104/nssa.html
> >
> > 'not-advertise' means do not advertise type 7
> > outside
> > of the NSSA. i.e. type 7 LSA stays in the NSSA area
> > and not to leak out to the rest of OSPF areas.
> >
> > There's another option 'no-redistribution' which
> > only
> > apply to a router that happens to be an NSSA ABR and
> > NSSA ASBR, by default this router will generate both
> > type 5 and type 7 LSAs into NSSA, this option will
> > save a little bit bandwidth and only send type 5
> > into
> > NSSA.
> >
> > HTH,
> > Chang
> > --- Jaspreet Bhatia <jasbhati@cisco.com> wrote:
> > > Hello Folks,
> > > When we get type 7
> > LSAs
> > > converted into Type 5
> > > LSAs at the NSSA ABR . there is an option to
> > control
> > > which type 7 LSA does
> > > not get converted into a type 5 LSA .
> > >
> > > summary-address prefix mask not-advertise
> > >
> > > I did not understand the working of this command .
> > > Can anyone throw some
> > > light on it ?
> > >
> > > TIA
> > >
> > > Jaspreet
> > >
> >
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:16 GMT-3