From: Paglia, John (USPC.PCT.Hopewell) (JPaglia@NA2.US.ML.com)
Date: Mon Oct 07 2002 - 18:26:43 GMT-3
if this was a lab question, given the addresses below with a question asking
you to "summarize to the shortest possible mask', wouldn't you indeed want
to make it 130.10.32.0 255.255.252.0 as Tim stated? That would be the
shortest mask while being able to ping those two subnets. The /27 mask seems
way too long...you could have just made it a /24 summary and have it work!
Long and short, if I see a question saying 'summarize to the shortest mask'
I am not going to be concerned with keeping a native 'b' address on a a 'c'
boundary, and am strictly going to be looking for the shortest mask possible
that allows functionality.
John
> -----Original Message-----
> From: Gustavo Figueira [SMTP:gufigueira@ig.com.br]
> Sent: Monday, October 07, 2002 4:57 PM
> To: Enrique Hernandez; Tim Medley; Ccielab
> Subject: Re: Route summarization with class C's
>
> Henrique,
>
> You are correct !
>
> Gustavo
>
>
> ----- Original Message -----
> From: "Enrique Hernandez" <enrique.hernandez@telindus.es>
> To: "Tim Medley" <tim.medley@ireadyworld.com>; "Ccielab"
> <ccielab@groupstudy.com>
> Sent: Monday, October 07, 2002 1:41 PM
> Subject: RE: Route summarization with class C's
>
>
> > Hi Tim,
> >
> > I think you can summarize a litle bit more because there are three more
> > matched bits regarding the two subnets.
> > In my opinion it would be like this:
> > 130.10.32.0 255.255.255.224
> >
> > Regards,
> >
> > Enrique Hernandez
> >
> > Network Engineer
> > Technical Department
> >
> --------------------------------------------------------------------------
> --
> > ----------
> > Telindus Spain
> > Plaza Ciudad de Viena, 6 2*Planta
> > Torre Metropolitana
> > E-28040 Madrid
> >
> --------------------------------------------------------------------------
> --
> > ----------
> > <mailto: enhe@telindus.es>
> > tel: +34 91 456 00 08
> > fax: +34 91 536 10 74
> >
> --------------------------------------------------------------------------
> --
> > ----------
> > For more information about our products and services,
> > please visit our website: <http://www.telindus.es>
> >
> --------------------------------------------------------------------------
> --
> > ----------
> > Secure connectivity & mobility
> >
> > > -----Mensaje original-----
> > > De: Tim Medley [SMTP:tim.medley@ireadyworld.com]
> > > Enviado el: lunes, 07 de octubre de 2002 18:17
> > > Para: Ccielab
> > > Asunto: Route summarization with class C's
> > >
> > > I'm having a couple of issues with summarizing some class C subnets. I
> > > was thinking that the matching bits needed to be in the same subnet
> > > class. I think I have this worked out correctly but I need someone to
> > > verify for me.
> > >
> > >
> > > 130.10.32.0 /28
> > > 130.10.32.16 /28
> > >
> > > If I convert to binary I get:
> > >
> > > 10000010.00001010.00101010.00000000
> > >
> > > 10000010.00001010.00101010.00010000
> > >
> > > To right most matching significant bits are:
> > >
> > > 10000010.00001010.00101010.00000000
> > >
> > > 10000010.00001010.00101010.00010000
> > >
> > > So my summary route would be 130.10.32.0 255.255.254.0
> > >
> > > Is this correct?
> > >
> > >
> > >
> > >
> > >
> > > Example 2
> > >
> > > 130.10.42.0 /26
> > > 130.10.42.64 /26
> > >
> > > Tim Medley, CCNP+Voice, CCDP, CWNA
> > > Sr. Network Architect
> > > VoIP Group
> > > iReadyWorld
> > >
> > > p 704.943.3615
> > > f 704.588.2826
> > >
> > >
> > >>>
> > 29th Telindus International Symposium
> > Thursday, October 24, 2002
> > Brussel Expo, Brussels, Belgium
> >
> > Meet over 2.000 business & ICT professionals for an in-depth networking
> > update at Telindus' 29th International Symposium.
> >
> > Check out the programme, partners, workshops and register now for free:
> > http://www.telindussymposium.com
> > <<<
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