From: HP-France,ex2 ("SANCHEZ-MONGE,ANTONIO)
Date: Sat Mar 20 2004 - 10:54:03 GMT-3
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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