Ascend's Multilink Protocol Plus (MP+)
RFC 1934

Document Type RFC - Informational (April 1996; No errata)
Was draft-rfced-info-smith (individual)
Last updated 2013-03-02
Stream Legacy
Formats plain text pdf htmlized bibtex
Stream Legacy state (None)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state RFC 1934 (Informational)
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                           K. Smith
Request For Comments: 1934                         Ascend Communications
Category: Informational                                       April 1996

                 Ascend's Multilink Protocol Plus (MP+)

Status of This Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.

Abstract

   This document proposes an extension to the PPP Multilink Protocol
   (MP) [1]. Multilink Protocol Plus (MP+) is a new control protocol for
   managing multiple data links that are bundled by MP.

Table Of Contents

1.      Introduction.................................................2
        1.1     Functional Description...............................2
        1.2     Conventions..........................................3
2.      General Overview.............................................3
        2.1     Operation............................................4
3.      MP+ Frame Formats............................................4
        3.1     Error Control (EC) Layer.............................6
                3.1.1   Error Control State Machine..................7
        3.2     Multilink Plus Control Messages......................9
        3.3     Multilink Plus Message Formats......................10
                3.3.1   VERSION_EXCHANGE_REQ Message Format.........10
                3.3.2   VERSION_EXCHANGE_RSP Message Format.........12
                3.3.3   ADD_REQ Message Format......................13
                3.3.4   ADD_RSP Message Format......................15
                3.3.5   ADD_COMPLETE Message Format.................16
                3.3.6   REMOVE_REQ Message Format...................17
                3.3.7   REMOVE_RSP Message Format...................17
                3.3.8   REMOVE_COMPLETE Message Format..............18
                3.3.9   CLOSE_REQ Message Format....................19
                3.3.10  CLOSE_RSP Message Format....................19
                3.3.11  REMOTE_MGMT_REQ Message Format..............20
                3.3.12  REMOTE_MGMT_RSP Message Format..............20
                3.3.13  REMOTE_MGMT_RX_REQ Message Format...........21
                3.3.14  REMOTE_MGMT_TX_REQ Message Format...........22
                3.3.15  REMOTE_MGMT_TX_RSP Message Format...........22
                3.3.16  CLEAR_REQ Message Format....................23
        3.4     Events..............................................23

Smith                        Informational                      [Page 1]
RFC 1934                Multilink Protocol Plus               April 1996

        3.5     State Machine.......................................25
                3.5.1   States......................................25
                3.5.2   Common Actions..............................26
                3.5.3   MP+STATE_INITIAL state machine..............32
                3.5.4   MP+STATE_IDLE state machine.................35
                3.5.5   MP+STATE_ADD state machine..................37
                3.5.6   MP+STATE_REMOVE state machine...............41
                3.5.7   MP+STATE_CLOSE state machine................44
4.      PPP LCP Extensions..........................................46
5.      Security Considerations.....................................47
6.      References..................................................47
7.      Author's Address............................................47

1. Introduction

   The PPP Multilink Protocol (MP), is a set of features that provide
   inverse multiplexing at the packet/fragment level by bundling
   multiple independent links between a fixed pair of systems, providing
   a virtual link with greater bandwidth than any of the constituent
   members.

   Once multiple channels have been established  MP is responsible for
   managing channel use to insure in-sequence delivery of user packets.

   MP+ is an extension to MP that adds an inband control channel to
   provide a new level of session management and control.

   MP+ also allows remote device management of (unconfigured) systems.
   This feature allows a network operations center to dial into an
   unconfigured system and remotely manage it, before ethernet
   interface, IP address, and other LCP and system configuration
   information is entered.  (This does require local configuration of
   the WAN interfaces to the extent required to answer an incoming
   call).

1.1 Functional Description

   The features of MP+ include:

   * Ability to negotiate to add and subtract channels when bandwidth
     needs change.

   * Phone number management so calling stations need not know every
     possible number; answering stations can manage their own resources.

   * A simple remote management interface.

Smith                        Informational                      [Page 2]
Show full document text