Multilink Point-To-Point Protocol (Mlppp); Figure 1: Mlppp 24-Bit Fragment Format - Alcatel-Lucent 7750 SR OS Interface Configuration Manual
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Multilink Point-to-Point Protocol (MLPPP)
Multilink point-to-point protocol is defined in the IETF RFC 1990, The PPP Multilink Protocol
(MP), and provides a way to distribute data across multiple links within an MLPPP bundle to
achieve high bandwidth. MLPPP allows for a single frame to be fragmented and transmitted across
multiple links. This allows for lower latency and also allows for a higher maximum receive unit
(MRU).
MP is negotiated during the initial LCP option negotiations of a standard PPP session. A router
indicates to its peer that it is willing to perform MLPPP by sending the MP option as part of the
initial LCP option negotiation. This negotiation indicates the following:
1. The system offering the option is capable of combining multiple physical links into one
2. The system is capable of receiving upper layer protocol data units (PDU) fragmented
3. The system is capable of receiving PDUs of size N octets where N is specified as part of
Once MLPPP has been successfully negotiated, the sending system is free to send PDUs
encapsulated and/or fragmented with the MP header.
MP introduces a new protocol type with a protocol ID (PID) of Ox003d.
show the MLPPP fragment frame structure. Framing to indicate the beginning and end of the
encapsulation is the same as that used by PPP, and described in PPP in HDLC-like framing [RFC
1662]. MP frames use the same HDLC address and control pair value as PPP, namely: Address -
OxFF and Control - Ox03. The two octet protocol field is also structured the same as in PPP
encapsulation. A summary of the MP encapsulation is shown in
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logical link;
using the MP header and reassembling the fragments back into the original PDU for
processing;
the option even if N is larger than the maximum receive unit (MRU) for a single physical
link.
1
1
0 1 2 3 4 5 6 7 8 9
0
1
Address 0xff
Control 0x03
B E
Fragment Data
Figure 1: MLPPP 24-bit Fragment Format
1
1
1
1
1
1
1
1
2
2
2
2
2
3
4
5
6
7
8
9
0
1
2
3
PID 0x003d
Sequence
Fragment Data...
FCS
7750 SR OS Interface Configuration Guide
Figure 1
Figure
1.
2
2
2
2
2
2
3
3
4
5
6
7
8
9
0
1
and
Figure 2
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