From: CCIE Study (studyccie@xxxxxxxxxxx)
Date: Wed Jan 02 2002 - 16:58:10 GMT-3
In my below example, I stated that R3 does not see NetB. The problem is
actually the other way around. R1 will not see NetC with this problem.
Redistributing connected into eigrp will fix the problem, as well as using a
less specific mask in ospf, i.e. network 1.0.0.0 0.255.255.255 area 0.
sorry for any confusion
>From: "Study CCIE" <studyccie@hotmail.com>
>Reply-To: "Study CCIE" <studyccie@hotmail.com>
>To: <ccielab@groupstudy.com>, "Jim Brown" <Jim.Brown@CaseLogic.com>
>Subject: Re: Simple OSPF question
>Date: Wed, 2 Jan 2002 09:33:00 -0600
>
>There is an issue with using the 0.0.0.0 mask, but it's version dependent.
>Let's say you have:
>
>netA--R1--netB--R2--netC--R3--netD
>
>eigrp--R1--eigrp--R2--ospf--R3--ospf
>
>R2 does mutual redistribution
>R3 does not see netB
>
>Some ios versions won't redistribute netB regardless of whether you have
>0.0.0.0 or 0.0.0.255. Newer ios versions (all 12.2 and some 12.1 I
>believe,
>correct me if I'm wrong) will redistribute netB regardless. Personally, I
>always use the 0.0.0.0 mask and redistribute connected into OSPF just to be
>safe.
>
>
>----- Original Message -----
>From: "Jim Brown" <Jim.Brown@CaseLogic.com>
>To: "'Study CCIE'" <studyccie@hotmail.com>; <ccielab@groupstudy.com>
>Sent: Wednesday, January 02, 2002 9:26 AM
>Subject: RE: Simple OSPF question
>
>
> > I thought I have heard of some mention about an issue with
>redistribution
> > when using the all 0's mask. I always use a wildcard mask to match the
> > network, but that's just me.
> >
> > -----Original Message-----
> > From: Study CCIE [mailto:studyccie@hotmail.com]
> > Sent: Wednesday, January 02, 2002 8:16 AM
> > To: ccielab@groupstudy.com
> > Subject: Re: Simple OSPF question
> >
> >
> > (Sorry if this posting comes up twice)
> >
> > Glenn,
> >
> > The preferred method for a single interface is '137.20.20.1 0.0.0.0 area
>x'
> > like you said. Let's say you have a lot of interfaces that fall in the
>same
> > range though. For example, 137.20.20.0/30 137.20.20.4/30 137.20.20.8/30
> > 137.20.20.12/30 ... 137.20.20.252/30
> >
> > Instead of a network statement for every interface at 137.20.20.1
>0.0.0.0
>a
> > x, you can use a single statement 'network 137.20.20.0 0.0.0.255 area x'
> >
> > Remember, in IGP, the network statement doesn't mean 'what networks will
>I
> > advertise'. It means, 'what interfaces will participate in this
>protocol'
> > In BGP however, the network statement does mean 'what networks will I
> > advertise'
> >
> > Hope this helps
> >
> > ----- Original Message -----
> > From: "Williams, Glenn" <WILLIAMSG@PANASONIC.COM>
> > To: <ccielab@groupstudy.com>
> > Sent: Wednesday, January 02, 2002 8:51 AM
> > Subject: Simple OSPF question
> >
> >
> > > Hi,
> > >
> > > Usually when I enable ospf on an interface, for example if the
> > > interface
> > is
> > > 137.20.20.1/24, I would say:
> > >
> > > net 137.20.20.1 0.0.0.0 area x
> > >
> > > I could say:
> > >
> > > net 137.20.20.0 0.0.0.255 area x
> > >
> > > but what would I gain?
> > >
> > > Just one of those questions I've been meaning to ask.
> > >
> > > GW
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:56:14 GMT-3