The Cisco IOS Link Fragmentation and Interleaving (LFI) feature uses Multilink PPP (MLP). MLP provides a method of splitting, recombining, and sequencing datagrams across multiple logical data links.Refer URL for more information
but I feel you did not understand my problem (probably because of my bad English) :-)
Surely, I used MLP when I tried to implement PPP LFI over L2TPv3. I've created interface, say, "Multilink1", assigned an IP-address to it, and enabled EIGRP on it. Then I've declared, say, "Virtual-PPP1" interface (with no IP-address) as "ppp multilink" and belonging to multilink group 1. The problem is that this did not work.
Or, more accurately, this worked until I entered "ppp multilink interleave" and "ppp multilink fragment delay 20" on the Multilink interface. From this moment only packets, small enough to go from the interface without L2-fragmentation, could pass through the link.
Debugging log (debug ppp multilink events showed the following):
MLP: Discard reassembled packet, class 0
MLP: Lost fragment 4E1 (all links out of sequence), class 0
MLP: Begin bit lost, discard fragment 4E5, class 0
MLP: Received lost fragment seq 4E1, expecting 4E6, class 0
MLP: Out of sync with peer, resyncing to last rcvd seq# (0004E1), class 0
MLP: Unusual jump in seq number, from 0004E6 to 0004E1, class 0
MLP: Lost fragment 4E5 (all links out of sequence), class 0
MLP: Discard reassembled packet
...and so on, with no end.
It is clear that sometimes one fragment comes to the destination with some delay, out of order. But when it finally arrives, the destination router (which evidently understands that this is the long-waited lost fragment) drops all the fragments it accumulated in its buffer, instead of trying to reassemble the whole frame.
I have no idea what prevents PPP fragments from being properly reassembled.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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