From: Packet Man (ccie2b@hotmail.com)
Date: Sat Mar 20 2004 - 10:59:37 GMT-3
Hey Ato,
You're a champ. thanks so much. I bet that many here on GS, in addition to
me, greatly appreciate your valuable contributions.
>From: "SANCHEZ-MONGE,ANTONIO (HP-France,ex2)"
><antonio.sanchez-monge@hp.com>
>Reply-To: "SANCHEZ-MONGE,ANTONIO (HP-France,ex2)"
><antonio.sanchez-monge@hp.com>
>To: "'Packet Man'" <ccie2b@hotmail.com>, ccielab@groupstudy.com
>Subject: RE: PPP over ATM
>Date: Sat, 20 Mar 2004 14:54:03 +0100
>
>Hi again,
>
>It depends on how the backbone router is configured.
>
>If it is configured with encapsulation aal5ciscoppp, then the first is the
>way to go (I would use a point-to-point subinterface if possible).
>
>If it is configured with encapsulation aal5snap, then both of the ways I
>mentioned will work. The only difference is that with the dialer approach
>you can ping your local interface, and with the virtual template you
>cannot.
>I learned that with the IE book.
>
>As for the encapsulation used by the backbone router, either it is
>mentioned
>or suggested in the task, or the proctor will tell you if you ask, or trial
>and error ;)
>
>Cheers,
>Ato.
>
>-----Original Message-----
>From: Packet Man [mailto:ccie2b@hotmail.com]
>Sent: sabado, 20 de marzo de 2004 14:49
>To: antonio.sanchez-monge@hp.com; ccielab@groupstudy.com
>Subject: RE: PPP over ATM
>
>
>Thanks again, Ato.
>
>And, please forgive me for asking still some more questions.
>
>You've now shown me 3 different ways to config ppp over ATM.
>
>Method 1
>
>interface virtual-template 1
> encapsulation ppp
> ip address x.x.x.x 255.255.255.0
>interface atm 3/0
> no ip address
> pvc 0/100
> encapsulation aal5ciscoppp virtual-template 1
>
>Method 2
> >
> >interface virtual-template 1
> > encapsulation ppp
> > ip address x.x.x.x 255.255.255.0
> >interface atm 3/0
> > no ip address
> >interface atm3/0.1 point-to-point
> > pvc 0/100
> > encapsulation aal5snap
> > protocol ppp virtual-template 1
> >
>
>Method 3
> >
> >interface dialer 0
> > encapsulation ppp
> > ip address x.x.x.x 255.255.255.0
> > dialer pool 1
> >interface atm 3/0
> > no ip address
> >interface atm3/0.1 point-to-point
> > pvc 0/100
> > encapsulation aal5snap
> > protocol ppp dialer
> > dialer pool-member 1
>
>Between these 3 different ways, how can I figure out which one is required
>during the actual Lab? Are they all functionally equivalent? Or, is it
>possible that the lab requirement for PPP over ATM is stated in such a way
>that only 1 of the above methods can correctly fulfill the lab requirement?
>
>Again, please forgive me for pounding this thing to death, but I know that
>if, during the lab, I can't get all the layer 2 stuff working properly, my
>chances of passing go down quite dramatically.
>
>And, thanks again for all your help.
> >
> >Cheers,
> >Ato.
> >
> >
> >
> >
> >
> >
> >
> >-----Original Message-----
> >From: Packet Man [mailto:ccie2b@hotmail.com]
> >Sent: sabado, 20 de marzo de 2004 13:58
> >To: antonio.sanchez-monge@hp.com; ccielab@groupstudy.com
> >Subject: RE: PPP over ATM
> >
> >
> >Thanks for your responses. They been very helpful.
> >
> >If possible could you also show me a sample config for your answer to
> >Q1, using "protocol ppp virtual-template" and "protocol ppp dialer"?
> >
> >
> > >From: "SANCHEZ-MONGE,ANTONIO (HP-France,ex2)"
> > ><antonio.sanchez-monge@hp.com>
> > >To: 'Packet Man' <ccie2b@hotmail.com>, ccielab@groupstudy.com
> > >Subject: RE: PPP over ATM
> > >Date: Sat, 20 Mar 2004 13:06:00 +0100
> > >
> > >Hi,
> > >
> > >-> 1) Is this the only way to config ppp aver ATM? If not, what
> > >-> other ways
> > >are there?
> > >
> > >You can also use aal5snap encapsulation and use the "protocol ppp
> > >virtual-template" or "protocol ppp dialer" command.
> > >
> > >-> 2) Is there an example of this way somewhere on the Doc CD or
> > >-> should I
> > >just memorize this?
> > >
> > >Dunno (never looked for it).
> > >
> > >-> 3) In the above example, will broadcast and multicast, by default
> > >transit
> > >over this interface or are there additional config commands which are
> > >necessary for that type of traffic? If so, what?
> > >
> > >This is controlled by the virtual access interface, which by default
> > >will allow broadcast and multicasts.
> > >
> > >-> 4) What are the pro's and con's of config ppp over ATM?
> > >
> > >Authentication, multilink, etc...
> > >
> > >-> 5) Could someone explain the underlying logic of the above config
> > >-> or
> > >point me to where I can find out and learn what's going on here?
> > >
> > >I think it is a proprietary Cisco encapsulation optimized for PPP
> > >(unlike aal5snap which is used to transport other kinds of traffic,
> > >like IP directly).
> > >
> > >Just trying to help, I am no ATM guru at all.
> > >
> > >Cheers,
> > >Ato.
> >
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