MLP (multilink PPP) as a technology exists to allow multiple links between a 
pair of sites to act as one logical link. MLP by itself originally didn't 
support Link Fragmentation and Interleaving (LFI) over Frame Relay. The two 
technologies that you are studying (MLP LFI Over FR/ATM and FRF.12) are, from 
your perspective, both methods of providing LFI. 

In terms of the IPExpert topology, we only have one link between a pair of 
sites (A to B and A to C). However, we can still use either MLP LFI over FR or 
FRF.12 to provide interleaving of delay-sensitive voice traffic with fragmented 
delay-insensitive traffic. 

In the "real-world," if you had low-speed Frame Relay links end-to-end, you'd 
use FRF.12.  If you had to deal with Frame Relay to ATM interworking, MLP LFI 
would be the better choice. Obviously, this is becoming an obsolete topic as we 
deal with less and less Frame Relay, very little if any ATM, and fewer and 
fewer links that are slower than 768 kbps. 

DQ
d...@cisco.com

Sent from my iPhone

On Jun 27, 2012, at 11:29 AM, "Krishna" <vinayak_...@yahoo.com> wrote:

> hi folks,
> 
> from my observations, i found that mlp would be used if and only if, there 
> are two sites connecting to a single site via the same physical interface. 
> And, for frf.12 we use it for ppp link. please correct me or advise me if i m 
> wrong.
> 
> Thank you
> krishna.
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