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SNMPv2-PDU by vendor RFC

SNMPv2-PDU file content

The SNMP protocol is used to for conveying information and commands between agents and managing entities. SNMP uses the User Datagram Protocol (UDP) as the transport protocol for passing data between managers and agents. The reasons for using UDP for SNMP are, firstly it has low overheads in comparison to TCP, which uses a 3-way hand shake for connection. Secondly, in congested networks, SNMP over TCP is a bad idea because TCP in order to maintain reliability will flood the network with retransmissions.

Management information (MIB) is represented as a collection of managed objects. These objects together form a virtual information base called MIB. An agent may implement many MIBs, but all agents must implement a particular MIB called MIB-II [16]. This standard defines variables for things such as interface statistics (interface speeds, MTU, octets sent, octets received, etc.) as well as various other things pertaining to the system itself (system location, system contact, etc.). The main goal of MIB-II is to provide general TCP/IP management information.

Use ActiveXperts Network Monitor 2019 to import vendor-specific MIB files, inclusing SNMPv2-PDU.


Vendor: RFC
Mib: SNMPv2-PDU  [download]  [view objects]
Tool: ActiveXperts Network Monitor 2019 [download]    (ships with advanced SNMP/MIB tools)
-- WinAgents MIB Extraction Wizard
-- Extracted from rfc3416.txt 16.03.2005 20:21:58

SNMPv2-PDU DEFINITIONS ::= BEGIN

ObjectName ::= OBJECT IDENTIFIER

ObjectSyntax ::= CHOICE {
      simple           SimpleSyntax,
      application-wide ApplicationSyntax }

SimpleSyntax ::= CHOICE {
      integer-value   INTEGER (-2147483648..2147483647),
      string-value    OCTET STRING (SIZE (0..65535)),
      objectID-value  OBJECT IDENTIFIER }

ApplicationSyntax ::= CHOICE {
      ipAddress-value        IpAddress,
      counter-value          Counter32,
      timeticks-value        TimeTicks,
      arbitrary-value        Opaque,
      big-counter-value      Counter64,
      unsigned-integer-value Unsigned32 }


IpAddress ::= [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4))

Counter32 ::= [APPLICATION 1] IMPLICIT INTEGER (0..4294967295)

Unsigned32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)

Gauge32 ::= Unsigned32

TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)

Opaque ::= [APPLICATION 4] IMPLICIT OCTET STRING

Counter64 ::= [APPLICATION 6]
              IMPLICIT INTEGER (0..18446744073709551615)

-- protocol data units

PDUs ::= CHOICE {
     get-request      GetRequest-PDU,
     get-next-request GetNextRequest-PDU,
     get-bulk-request GetBulkRequest-PDU,
     response         Response-PDU,
     set-request      SetRequest-PDU,
     inform-request   InformRequest-PDU,
     snmpV2-trap      SNMPv2-Trap-PDU,
     report           Report-PDU }

-- PDUs

GetRequest-PDU ::= [0] IMPLICIT PDU

GetNextRequest-PDU ::= [1] IMPLICIT PDU

Response-PDU ::= [2] IMPLICIT PDU

SetRequest-PDU ::= [3] IMPLICIT PDU

-- [4] is obsolete

GetBulkRequest-PDU ::= [5] IMPLICIT BulkPDU

InformRequest-PDU ::= [6] IMPLICIT PDU

SNMPv2-Trap-PDU ::= [7] IMPLICIT PDU

--   Usage and precise semantics of Report-PDU are not defined
--   in this document.  Any SNMP administrative framework making
--   use of this PDU must define its usage and semantics.

Report-PDU ::= [8] IMPLICIT PDU

max-bindings INTEGER ::= 2147483647

PDU ::= SEQUENCE {
        request-id INTEGER (-214783648..214783647),

        error-status                -- sometimes ignored
            INTEGER {
                noError(0),
                tooBig(1),
                noSuchName(2),      -- for proxy compatibility
                badValue(3),        -- for proxy compatibility
                readOnly(4),        -- for proxy compatibility
                genErr(5),
                noAccess(6),
                wrongType(7),
                wrongLength(8),
                wrongEncoding(9),
                wrongValue(10),
                noCreation(11),
                inconsistentValue(12),
                resourceUnavailable(13),
                commitFailed(14),
                undoFailed(15),
                authorizationError(16),
                notWritable(17),
                inconsistentName(18)
            },

        error-index                 -- sometimes ignored
            INTEGER (0..max-bindings),

        variable-bindings           -- values are sometimes ignored
            VarBindList
    }

BulkPDU ::=                         -- must be identical in
    SEQUENCE {                      -- structure to PDU
        request-id      INTEGER (-214783648..214783647),
        non-repeaters   INTEGER (0..max-bindings),
        max-repetitions INTEGER (0..max-bindings),

        variable-bindings           -- values are ignored
            VarBindList
    }

-- variable binding

VarBind ::= SEQUENCE {
        name ObjectName,

        CHOICE {
            value          ObjectSyntax,
            unSpecified    NULL,    -- in retrieval requests

                                    -- exceptions in responses
            noSuchObject   [0] IMPLICIT NULL,
            noSuchInstance [1] IMPLICIT NULL,
            endOfMibView   [2] IMPLICIT NULL
        }
    }

-- variable-binding list

VarBindList ::= SEQUENCE (SIZE (0..max-bindings)) OF VarBind

END