From: Roy Dempsey (roy.dempsey@gmail.com)
Date: Mon Apr 04 2005 - 18:13:52 GMT-3
Thanks Jongsoo,
I'm not sure that aal5ciscoppp and ppp over atm using aal5snap are
entirely compatible. At least when I practiced on a remote lab I had
to match up both ends.
Has anyone else any experience with PPP over ATM and its different
variations. When would you use one over another?
Thanks
On Apr 4, 2005 8:56 PM, Jongsoo kim <bstrt2002@gmail.com> wrote:
> See below
>
> On Apr 4, 2005 2:55 PM, Roy Dempsey <roy.dempsey@gmail.com> wrote:
> > Hi,
> >
> > I've had to return to a topic which I thought I knew, but which I've
> > become confused about. I'm no ATM expert and my access to ATM
> > equipment is limited so I'm hoping someone can help me gain some
> > understanding on this topic. I have the following questions:
> >
> > 1. I think there are 4 possible ways to configure PPP over ATM.
> > Under the assigned PVC:
> > A. Protocol ppp virtual-template 1
> > B. Protocol ppp dialer & dialer pool-member
> > C. encapsulation aal5ciscoPPP virtual-template 1
> > D. encapsulation aal5autoppp virtual-template 1
> >
> > Are there any others?
>
> ########## I understand all of above are compatible with each others.
>
> > 2. For any of the above do you need to specify encapsulation ppp under
> > the virtual-template? I think its the default but most examples show
> > it configured. It would need to be added to the dialer interface,
> > correct? ( Yes)
>
>
>
> > 3. Are A and B locally significant only? In other words, can you
> > configure either when configuring PPP over ATM, and both should work
> > regardless of the other end. I don't think the other end should care
> > whether a virtual-template or a dialer interface are configured but
> > I'd like to check.
>
> ###### yes I understand dialer / ppp enc and VT are compatible.
>
>
> > 4. If you're asked to configure PPP over ATM, I would assume that you
> > are required to do either A or B above, as aal5ciscoPPP is a Cisco
> > variation. Dangerous assumption?
>
> ### As I undertand all of them are compatible, it doesn't really matter
> which one to use.
> someone can collect me.
>
> > 5. I have labbed all of the above apart from 4 up with no difficulty.
> > However, in the lab one end would already be configured. Apart from
> > using ilmi-pvc-discovery to find out the PVC and encapsulation
> > information, are there any other useful debug commands.
> For SVC,
> "show atm ilmi-status" will show nsap address after pvc 0/16 ilmi , pvc 0/5
> qsaal ans esi-address are configured.
>
>
> > 6. I haven't seen any examples of aal5autoppp and when you would use
> > it. Can someone explain it and when you would use it? Is is applicable
> > to the R & S exam?
>
> aal5autoppp is needed when you run PPPoA or PPPoE
>
>
> > Are there any other possible variations I should be aware of for the
> > lab? Any other tips or potential pitfalls?
> >
> > Thanks
> > Roy
> >
> >
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