From http://net-snmp.sourceforge.net/docs/mibs/SNMP-MPD-MIB.txt

SNMP-MPD-MIB DEFINITIONS ::= BEGIN

IMPORTS
    MODULE-COMPLIANCE, OBJECT-GROUP         FROM SNMPv2-CONF
    MODULE-IDENTITY, OBJECT-TYPE,
    snmpModules, Counter32                  FROM SNMPv2-SMI;

snmpMPDMIB MODULE-IDENTITY
    LAST-UPDATED "200210140000Z"
    ORGANIZATION "SNMPv3 Working Group"
    CONTACT-INFO "WG-EMail:   snmpv3@lists.tislabs.com
                  Subscribe:  snmpv3-request@lists.tislabs.com

                  Co-Chair:   Russ Mundy
                              Network Associates Laboratories
                  postal:     15204 Omega Drive, Suite 300
                              Rockville, MD 20850-4601
                              USA

                  EMail:      mundy@tislabs.com
                  phone:      +1 301-947-7107

                  Co-Chair &
                  Co-editor:  David Harrington
                              Enterasys Networks
                  postal:     35 Industrial Way
                              P. O. Box 5005
                              Rochester NH 03866-5005
                              USA
                  EMail:      dbh@enterasys.com
                  phone:      +1 603-337-2614

                  Co-editor:  Jeffrey Case
                              SNMP Research, Inc.
                  postal:     3001 Kimberlin Heights Road
                              Knoxville, TN 37920-9716
                              USA
                  EMail:      case@snmp.com
                  phone:      +1 423-573-1434

                  Co-editor:  Randy Presuhn
                              BMC Software, Inc.
                  postal:     2141 North First Street
                              San Jose, CA 95131
                              USA
                  EMail:      randy_presuhn@bmc.com
                  phone:      +1 408-546-1006

                  Co-editor:  Bert Wijnen
                              Lucent Technologies
                  postal:     Schagen 33
                              3461 GL Linschoten
                              Netherlands
                  EMail:      bwijnen@lucent.com
                  phone:      +31 348-680-485
                 "
    DESCRIPTION  "The MIB for Message Processing and Dispatching

                  Copyright (C) The Internet Society (2002). This
                  version of this MIB module is part of RFC 3412;
                  see the RFC itself for full legal notices.
                 "
    REVISION     "200210140000Z"            -- 14 October 2002
    DESCRIPTION  "Updated addresses, published as RFC 3412."
    REVISION     "199905041636Z"            -- 4 May 1999
    DESCRIPTION  "Updated addresses, published as RFC 2572."

    REVISION     "199709300000Z"            -- 30 September 1997
    DESCRIPTION  "Original version, published as RFC 2272."
    ::= { snmpModules 11 }

-- Administrative assignments ***************************************

snmpMPDAdmin           OBJECT IDENTIFIER ::= { snmpMPDMIB 1 }
snmpMPDMIBObjects      OBJECT IDENTIFIER ::= { snmpMPDMIB 2 }
snmpMPDMIBConformance  OBJECT IDENTIFIER ::= { snmpMPDMIB 3 }

-- Statistics for SNMP Messages *************************************

snmpMPDStats           OBJECT IDENTIFIER ::= { snmpMPDMIBObjects 1 }

snmpUnknownSecurityModels OBJECT-TYPE
    SYNTAX       Counter32
    MAX-ACCESS   read-only
    STATUS       current
    DESCRIPTION "The total number of packets received by the SNMP
                 engine which were dropped because they referenced a
                 securityModel that was not known to or supported by
                 the SNMP engine.
                "
    ::= { snmpMPDStats 1 }

snmpInvalidMsgs OBJECT-TYPE
    SYNTAX       Counter32
    MAX-ACCESS   read-only
    STATUS       current
    DESCRIPTION "The total number of packets received by the SNMP
                 engine which were dropped because there were invalid
                 or inconsistent components in the SNMP message.
                "
    ::= { snmpMPDStats 2 }

snmpUnknownPDUHandlers OBJECT-TYPE
    SYNTAX       Counter32
    MAX-ACCESS   read-only
    STATUS       current
    DESCRIPTION "The total number of packets received by the SNMP
                 engine which were dropped because the PDU contained
                 in the packet could not be passed to an application
                 responsible for handling the pduType, e.g. no SNMP
                 application had registered for the proper
                 combination of the contextEngineID and the pduType.
                "
    ::= { snmpMPDStats 3 }

-- Conformance information ******************************************

snmpMPDMIBCompliances OBJECT IDENTIFIER ::= {snmpMPDMIBConformance 1}
snmpMPDMIBGroups      OBJECT IDENTIFIER ::= {snmpMPDMIBConformance 2}

-- Compliance statements

snmpMPDCompliance MODULE-COMPLIANCE
    STATUS       current
    DESCRIPTION "The compliance statement for SNMP entities which
                 implement the SNMP-MPD-MIB.
                "
    MODULE    -- this module
        MANDATORY-GROUPS { snmpMPDGroup }
    ::= { snmpMPDMIBCompliances 1 }

snmpMPDGroup OBJECT-GROUP
    OBJECTS {
              snmpUnknownSecurityModels,
              snmpInvalidMsgs,
              snmpUnknownPDUHandlers
            }
    STATUS       current
    DESCRIPTION "A collection of objects providing for remote
                 monitoring of the SNMP Message Processing and
                 Dispatching process.
                "
    ::= { snmpMPDMIBGroups 1 }

END