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PPP Bridging Control Protocol (BCP)
RFC 1638

Document type: RFC - Proposed Standard (June 1994; No errata)
Obsoleted by RFC 2878
Obsoletes RFC 1220
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
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IESG State: RFC 1638 (Proposed Standard)
Responsible AD: (None)
Send notices to: No addresses provided

Network Working Group                                           F. Baker
Request For Comments: 1638                                           ACC
Category: Standards Track                                       R. Bowen
                                                                     IBM
                                                                 Editors
                                                               June 1994

                  PPP Bridging Control Protocol (BCP)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   The Point-to-Point Protocol (PPP) [6] provides a standard method for
   transporting multi-protocol datagrams over point-to-point links.  PPP
   defines an extensible Link Control Protocol, and proposes a family of
   Network Control Protocols for establishing and configuring different
   network-layer protocols.

   This document defines the Network Control Protocol for establishing
   and configuring Remote Bridging for PPP links.

Table of Contents

     1.     Historical Perspective ................................    2
     2.     Methods of Bridging ...................................    3
        2.1       Transparent Bridging ............................    3
        2.2       Remote Transparent Bridging .....................    3
        2.3       Source Routing ..................................    4
        2.4       Remote Source Route Bridging ....................    5
        2.5       SR-TB Translational Bridging ....................    6
     3.     Traffic Services ......................................    6
        3.1       LAN Frame Checksum Preservation .................    6
        3.2       Traffic having no LAN Frame Checksum ............    6
        3.3       Tinygram Compression ............................    7
        3.4       LAN Identification ..............................    7
     4.     A PPP Network Control Protocol for Bridging ...........    9
        4.1       Sending Bridge Frames ...........................   10
           4.1.1  Maximum Receive Unit Considerations .............   10
           4.1.2  Loopback and Link Quality Monitoring ............   11
           4.1.3  Message Sequence ................................   11

Baker & Bowen                                                   [Page 1]
RFC 1638                      PPP Bridging                     June 1994

           4.1.4  Separation of Spanning Tree Domains .............   11
        4.2       Bridged LAN Traffic .............................   12
        4.3       Spanning Tree Bridge PDU ........................   16
     5.     BCP Configuration Options .............................   17
        5.1       Bridge-Identification ...........................   17
        5.2       Line-Identification .............................   19
        5.3       MAC-Support .....................................   20
        5.4       Tinygram-Compression ............................   21
        5.5       LAN-Identification ..............................   22
        5.6       MAC-Address .....................................   23
        5.7       Spanning-Tree-Protocol ..........................   24
        APPENDICES ................................................   26
        A.     Tinygram-Compression Pseudo-Code ...................   26
        SECURITY CONSIDERATIONS ...................................   27
        REFERENCES ................................................   27
     ACKNOWLEDGEMENTS .............................................   28
     CHAIR'S ADDRESS ..............................................   28
     AUTHOR'S ADDRESS .............................................   28

1.  Historical Perspective

   Two basic algorithms are ambient in the industry for Bridging of
   Local Area Networks.  The more common algorithm is called
   "Transparent Bridging", and has been standardized for Extended LAN
   configurations by IEEE 802.1.  The other is called "Source Route
   Bridging", and is prevalent on IEEE 802.5 Token Ring LANs.

   The IEEE has combined these two methods into a device called a Source
   Routing Transparent (SRT) bridge, which concurrently provides both
   Source Route and Transparent bridging.  Transparent and SRT bridges
   are specified in IEEE standard 802.1D [3].

   Although IEEE committee 802.1G is addressing remote bridging [2],
   neither standard directly defines the mechanisms for implementing
   remote bridging.  Technically, that would be beyond the IEEE 802

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