7705 SAR Interfaces
68
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
3.2.1 Multilink Point-to-Point Protocol
This section contains information on the following topics:
• MLPPP Overview
• Protocol Field (PID)
• B&E Bits
• Sequence Number
• Information Field
• Padding
• FCS
• LCP
• T1/E1 Link Hold Timers
3.2.1.1 MLPPP Overview
Multilink point-to-point protocol (MLPPP) is a method of splitting, recombining, and
sequencing packets across multiple logical data links. MLPPP is defined in the IETF
RFC 1990, The PPP Multilink Protocol (MP).
MLPPP allows multiple PPP links to be bundled together, providing a single logical
connection between two routers. Data can be distributed across the multiple links
within a bundle to achieve high bandwidth. As well, MLPPP allows for a single frame
to be fragmented and transmitted across multiple links. This capability allows for
lower latency and also for a higher maximum receive unit (MRU).
Multilink protocol is negotiated during the initial LCP option negotiations of a standard
PPP session. A system indicates to its peer that it is willing to perform MLPPP by
sending the MP option as part of the initial LCP option negotiation.
The system indicates the following capabilities.
• The system offering the option is capable of combining multiple physical links
into one logical link.
• The system is capable of receiving upper layer protocol data units (PDUs) that
are fragmented using the MP header and then reassembling the fragments back
into the original PDU for processing.
• The system is capable of receiving PDUs of size N octets, where N is specified
as part of the option, even if N is larger than the maximum receive unit (MRU)
for a single physical link.
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