From: Le Anh Duong (duongla@vnn.vn)
Date: Mon Oct 24 2005 - 04:11:05 GMT-3
Hi,
FYI, I have found that aal5ciscoppp is required when PPP authentication is
desired.
Duong
----- Original Message -----
From: "Dennis J. Hartmann" <dhartma5@optonline.net>
To: "'Le Anh Duong'" <duongla@vnn.vn>
Sent: Monday, October 24, 2005 8:34 AM
Subject: RE: CiscoPress CCIE R&S Practice lab3: PPPoA
> You better go out and buy some real labs if you want to have a
> prayer of passing the real thing..... :-)
> -Dennis
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Le
> Anh Duong
> Sent: Saturday, October 22, 2005 8:00 AM
> To: Cisco certification
> Subject: CiscoPress CCIE R&S Practice lab3: PPPoA
>
> Hi group,
>
> I am very confused with the solution of ATM part, lab 3. Pls help.
> Requirement:
> Configure the ATM PVCs as shown in Figure 3-12. Use point-to-point
> subinterfaces and use the new format PVC vpi/vcConfigure the ATM PVCs as
> shown in Figure 3-12. Use point-to-point subinterfaces and use the new
> format PVC vpi/vci when configuring the PVCs. Ensure that the ATM
> subinterfaces contain purely Layer 2 information, configure virtual Layer
3
> addresses elsewhere for the ATM connectivity, and make this connectivity
as
> secure as possible. This configuration does not require any form of
> bridging.
> Figure 3-12: R6 atm1/0-------------ATM cloud-------------atm3/0 R5
> VPI/VCI: 0/99 for both R6 and R5
> (No more any other information)
>
> Solution:
> The clues to the question are not configuring Layer 3 and making it
secure.
> The only way of achieving this is using PPP. ATM is capable of running PPP
> but it requires the encapsulation type aal5ciscoppp and the reference to a
> virtual-template interface.
>
> My confusion is
> 1. Why the aal5ciscoppp encapsulation type is "required" ? Why is it not
LLC
> or MUX encapsulation ?
> 2. Do we need to map layer 3 (IP address) information to the pvc
statically
> like in the solution ( I think not because PPP is encapsulated over ATM
not
> IP):
> pvc 0/99
> protocol ip a.b.c.d broadcast
>
> Thanks
> Duong
>
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