From: ying c (bf5tgh1@xxxxxxxxx)
Date: Mon Aug 05 2002 - 16:39:23 GMT-3
Dmitry,
You are right. I just have to read it more carefully.
There should be no type 5 in NSSA.
Thanks,
Chang
--- "Volkov, Dmitry (Toronto - BCE)"
<dmitry_volkov@ca.ml.com> wrote:
>
> Chang,
>
> I'm still thinking that i'm right.
> You said about "nssa no-redistribution" :
>
> > this option will
> > save a little bit bandwidth and only send type 5
> > into
> > NSSA.
>
> It will not send LSA 5 into nssa area (i guess it's
> not possible to have lsa
> 5 in nssa at all)
> as well it will not send LSA 7 into nssa area (as
> regular nssa ASBR does).
> (I think that it will proceed lsa 7 received from
> other routers in the same
> nssa area)
>
> The same time router with "nssa no-redistribution",
> being ASBR will inject LSA 5 to backbone.
>
> Dmitry
>
> -----Original Message-----
> From: ying c [mailto:bf5tgh1@yahoo.com]
> Sent: Monday, August 05, 2002 12:36 PM
> To: Volkov, Dmitry (Toronto - BCE)
> Cc: ccielab@groupstudy.com; Jaspreet Bhatia
> Subject: RE: NSSA Type 7 to Type 5 question
>
>
> 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
> > >
> >
>
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