rfc3292.txt

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Network Working Group                                           A. Doria
Request for Comments: 3292                Lulea University of Technology
Category: Standards Track                                  F. Hellstrand
                                                              K. Sundell
                                                         Nortel Networks
                                                              T. Worster
                                                               June 2002


              General Switch Management Protocol (GSMP) V3

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.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This document describes the General Switch Management Protocol
   Version 3 (GSMPv3).  The GSMPv3 is an asymmetric protocol that allows
   one or more external switch controllers to establish and maintain the
   state of a label switch such as, an ATM, frame relay or MPLS switch.
   The GSMPv3 allows control of both unicast and multicast switch
   connection state as well as control of switch system resources and
   QoS features.

Acknowledgement

   GSMP was created by P. Newman, W. Edwards, R. Hinden, E. Hoffman, F.
   Ching Liaw, T. Lyon, and G. Minshall (see [6] and [7]).  This version
   of GSMP is based on their work.

Contributors

   In addition to the authors/editors listed in the heading, many
   members of the GSMP group have made significant contributions to this
   specification.  Among the contributors who have contributed
   materially are: Constantin Adam, Clint Bishard, Joachim Buerkle,
   Torbjorn Hedqvist, Georg Kullgren, Aurel A. Lazar, Mahesan
   Nandikesan, Matt Peters, Hans Sjostrand, Balaji Srinivasan, Jaroslaw
   Sydir, Chao-Chun Wang.



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RFC 3292         General Switch Management Protocol V3         June 2002


Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Table of Contents

   1. Introduction ................................................... 4
   2. GSMP Packet Encapsulation ...................................... 6
   3. Common Definitions and Procedures .............................. 6
    3.1 GSMP Packet Format ........................................... 7
      3.1.1 Basic GSMP Message format ................................ 7
      3.1.2 Fields commonly found in GSMP messages .................. 11
      3.1.3 Labels .................................................. 12
      3.1.4 Failure Response Messages ............................... 17
   4. Connection Management Messages ................................ 18
    4.1 General Message Definitions ................................. 18
    4.2 Add Branch Message .......................................... 25
      4.2.1 ATM specific procedures: ................................ 29
    4.3 Delete Tree Message ......................................... 30
    4.4 Verify Tree Message ......................................... 30
    4.5 Delete All Input Port Message ............................... 30
    4.6 Delete All Output Port Message .............................. 31
    4.7 Delete Branches Message ..................................... 32
    4.8 Move Output Branch Message .................................. 35
      4.8.1 ATM Specific Procedures: ................................ 37
    4.9 Move Input Branch Message ................................... 38
      4.9.1 ATM Specific Procedures: ................................ 41
   5. Reservation Management Messages ............................... 42
    5.1 Reservation Request Message ................................. 43
    5.2 Delete Reservation Message .................................. 46
    5.3 Delete All Reservations Message.............................. 47
   6. Management Messages ........................................... 47
    6.1 Port Management Message ..................................... 47
    6.2 Label Range Message ......................................... 53
      6.2.1 Labels .................................................. 56
   7. State and Statistics Messages ................................. 60
    7.1 Connection Activity Message ................................. 61
    7.2 Statistics Messages ......................................... 64
      7.2.1 Port Statistics Message ................................. 67
      7.2.2 Connection Statistics Message ........................... 67
      7.2.3 QoS Class Statistics Message ............................ 68
    7.3 Report Connection State Message ............................. 68
   8. Configuration Messages ........................................ 73
    8.1 Switch Configuration Message ................................ 73
      8.1.1 Configuration Message Processing ........................ 75
    8.2 Port Configuration Message .................................. 75



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      8.2.1 PortType Specific Data .................................. 79
    8.3 All Ports Configuration Message ............................. 87
    8.4 Service Configuration Message ............................... 89
   9. Event Messages ................................................ 93
    9.1 Port Up Message ............................................  95
    9.2 Port Down Message ..........................................  95
    9.3 Invalid Label Message ......................................  95
    9.4 New Port Message ...........................................  96
    9.5 Dead Port Message ..........................................  96
    9.6 Adjacency Update Message ...................................  96
   10. Service Model Definition ....................................  96
    10.1 Overview ..................................................  96
    10.2 Service Model Definitions .................................  97
      10.2.1 Original Specifications ...............................  97
      10.2.2 Service Definitions ...................................  98
      10.2.3 Capability Sets .......................................  99
    10.3 Service Model Procedures ..................................  99
    10.4 Service Definitions ....................................... 100
      10.4.1 ATM Forum Service Categories .......................... 101
      10.4.2 Integrated Services ................................... 104
      10.4.3 MPLS CR-LDP ........................................... 105
      10.4.4 Frame Relay ........................................... 105
      10.4.5 DiffServ .............................................. 106
    10.5 Format and Encoding of the Traffic Parameters ............. 106
      10.5.1 Traffic Parameters for ATM Forum Services ............. 106
      10.5.2 Traffic Parameters for Int-Serv Controlled Load Service 107
      10.5.3 Traffic Parameters for CRLDP Service .................. 108
      10.5.4 Traffic Parameters for Frame Relay Service ............ 109
    10.6 Traffic Controls (TC) Flags ............................... 110
   11. Adjacency Protocol .......................................... 111
    11.1 Packet Format ............................................. 112
    11.2 Procedure ................................................. 115
      11.2.1 State Tables .......................................... 117
    11.3 Partition Information State ............................... 118
    11.4 Loss of Synchronisation.................................... 119
    11.5 Multiple Controllers Per Switch Partition ................. 119
      11.5.1 Multiple Controller Adjacency Process ................. 120
   12. Failure Response Codes ...................................... 121
    12.1 Description of Failure and Warning Response Messages ...... 121
    12.2 Summary of Failure Response Codes and Warnings ............ 127
   13. Security Considerations ..................................... 128
   Appendix A  Summary of Messages ................................. 129
   Appendix B  IANA Considerations ................................. 130
   References ...................................................... 134
   Authors' Addresses .............................................. 136
   Full Copyright Statement ........................................ 137





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RFC 3292         General Switch Management Protocol V3         June 2002


1.  Introduction

   The General Switch Management Protocol (GSMP) is a general purpose
   protocol to control a label switch.  GSMP allows a controller to
   establish and release connections across the switch, add and delete
   leaves on a multicast connection, manage switch ports, request
   configuration information, request and delete reservation of switch
   resources, and request statistics.  It also allows the switch to
   inform the controller of asynchronous events such as a link going
   down.  The GSMP protocol is asymmetric, the controller being the
   master and the switch being the slave.  Multiple switches may be
   controlled by a single controller using multiple instantiations of
   the protocol over separate control connections.  Also a switch may be
   controlled by more than one controller by using the technique of
   partitioning.

   A "physical" switch can be partitioned into several virtual switches
   that are referred to as partitions.  In this version of GSMP, switch
   partitioning is static and occurs prior to running GSMP.  The
   partitions of a physical switch are isolated from each other by the
   implementation and the controller assumes that the resources
   allocated to a partition are at all times available to that
   partition.  A partition appears to its controller as a label switch.
   Throughout the rest of this document, the term switch (or
   equivalently, label switch) is used to refer to either a physical,
   non-partitioned switch or to a partition.  The resources allocated to
   a partition appear to the controller as if they were the actual
   physical resources of the partition.  For example if the bandwidth of
   a port were divided among several partitions, each partition would
   appear to the controller to have its own independent port.

   GSMP controls a partitioned switch through the use of a partition
   identifier that is carried in every GSMP message.  Each partition has
   a one-to-one control relationship with its own logical controller
   entity (which in the remainder of the document is referred to simply
   as a controller) and GSMP independently maintains adjacency between
   each controller-partition pair.

   Kinds of label switches include frame or cell switches that support
   connection oriented switching, using the exact match-forwarding
   algorithm based on labels attached to incoming cells or frames.  A
   switch is assumed to contain multiple "ports".  Each port is a
   combination of one "input port" and one "output port".  Some GSMP
   requests refer to the port as a whole, whereas other requests are
   specific to the input port or the output port.  Cells or labelled
   frames arrive at the switch from an external communication link on





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   incoming labelled channels at an input port.  Cells or labelled
   frames depart from the switch to an external communication link on
   labelled channels from an output port.

   A switch may support multiple label types, however, each switch port
   can support only one label type.  The label type supported by a given
   port is indicated by the switch to the controller in a port
   configuration message.  Connections may be established between ports,
   supporting different label types.  Label types include ATM, Frame
   Relay, MPLS Generic and FEC Labels.

   A connection across a switch is formed by connecting an incoming
   labelled channel to one or more outgoing labelled channels.
   Connections are referenced by the input port on which they originate
   and the Label values of their incoming labelled channel.

   GSMP supports point-to-point and point-to-multipoint connections.  A
   multipoint-to-point connection is specified by establishing multiple
   point-to-point connections, each of them specifying the same output
   branch.  A multipoint-to-multipoint connection is specified by
   establishing multiple point-to-multipoint trees each of them
   specifying the same output branches.

   In general a connection is established with a certain quality of
   service (QoS).  This version of GSMP includes a default QoS
   Configuration and additionally allows the negotiation of alternative,
   optional QoS configurations.  The default QoS Configuration includes
   three QoS Models: a Service Model, a Simple Abstract Model (strict
   priorities) and a QoS Profile Model.

   The Service Model is based on service definitions found external to
   GSMP such as in Integrated Services or ATM Service Categories.  Each
   connection is assigned a specific service that defines the handling
   of the connection by the switch.  Additionally, traffic parameters
   and traffic controls may be assigned to the connection depending on
   the assigned service.

   In the Simple Abstract Model, a connection is assigned a priority
   when it is established.  It may be assumed that for connections that
   share the same output port, a cell or frame on a connection with a
   higher priority is much more likely to exit the switch before a cell
   or frame on a connection with a lower priority if they are both in
   the switch at the same time.  The number of priorities that each port
   of the switch supports may be obtained from the port configuration
   message.






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   The QoS Profile Model provides a simple mechanism that allows
   connection to be assigned QoS semantics defined externally to GSMP.