From: alsontra@hotmail.com
Date: Thu Mar 11 2004 - 20:42:57 GMT-3
In production environments, I have always used encapsulation type aal5snap,
because aal5ciscoppp is CISCO proprietary. As far as the lab goes, example
1 should always work. Or at least that's what I plan to use. However in a
purely Cisco environment, I would think the encapsulations are equivalent or
interchangeable.
<snip>
Q. What are the different PVC encapsulation types?
A. The following are the four different PVC encapsulation types:
------->aal5ciscoppp: For Cisco's proprietary PPP over ATM, aal5ciscoppp
supports only Cisco routers with ATM or asymmetric digital subscriber line
(ADSL) interfaces. Use this type of encapsulation when PPP authentication is
desired.
aal5mux: AAL5 MUX encapsulation supports only a single protocol (IP or IPX)
per PVC.
aal5nlpid: AAL5 Network Layer Protocol Identification (NLPID) encapsulation
allows ATM interfaces to interoperate with High-Speed Serial Interfaces
(HSSIs) that are using an ATM data service unit (ADSU) and running ATM-Data
Exchange Interface (DXI).
aal5snap: AAL5 Logical Link Control/Subnetwork Access Protocol (LLC/SNAP)
encapsulation supports Inverse ARP and incorporates the LLC/SNAP that
precedes the protocol datagram. This allows the multiple protocols to
transverse the same PVC.
</snip>
http://www.cisco.com/en/US/tech/tk39/tk48/technologies_q_and_a_item09186a008011a901.shtml
$.02
Alsontra
----- Original Message -----
From: "MADMAN" <dmadlan@qwest.com>
To: "Lord, Chris" <chris.lord@lorien.co.uk>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, March 11, 2004 1:06 PM
Subject: Re: PPP over ATM using Virt-Template
> All I can say is I have many times used, successfully, example 1 but
> short of trial and error or debugging I don't know how you can tell
> without knowledge of the other side config.
>
> Dave
>
> Lord, Chris wrote:
>
> > Hi Group,
> >
> > Can anyone help clarify this for me please. I have come across two
different lab scenarios where a router has to connect to a BB router using
PPP over ATM with a Virtual Template. The solutions to these two scenarios
were as follows:
> >
> > 1)
> > int virtual-template 1
> > ip address x.x.x.x y.y.y.y
> > encaps ppp
> >
> > int atm 0/1.6 point-to-point
> > pvc 10/101
> > encapsulation aal5ciscoppp virtual-template 1
> >
> >
> > 2)
> > int virtual-template 1
> > ip address x.x.x.x y.y.y.y
> > encaps ppp
> >
> > int atm 0/1.6 point-to-point
> > pvc 10/101
> > encapsulation aal5snap
> > protocol ppp virtual-template 1
> >
> > Neither of the labs gave any hint as to how the BB router had been
configured or which method it was expecting. If we were faced with a PPP-ATM
question in the real lab is there any way of determining which to use other
than by trail-and-error - e.g. a debug or show command?
> >
> > Thx,
> > Chris.
> >
> >
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