RFC1155-SMI device MIB details by RFC

RFC1155-SMI 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 2024 to import vendor-specific MIB files, inclusing RFC1155-SMI.

Vendor:	RFC
Mib:	RFC1155-SMI  [download]  [view objects]
Tool:	ActiveXperts Network Monitor 2024 [download]    (ships with advanced SNMP/MIB tools)

-- WinAgents MIB Extraction Wizard
-- Extracted from rfc1155.txt 17.03.2005 16:16:50

RFC1155-SMI DEFINITIONS ::= BEGIN

--EXPORTS  EVERYTHING
--        internet, directory, mgmt,
--        experimental, private, enterprises,
--        OBJECT-TYPE, ObjectName, ObjectSyntax, SimpleSyntax,
--        ApplicationSyntax, NetworkAddress, IpAddress,
--        Counter, Gauge, TimeTicks, Opaque;

 -- the path to the root

 internet      OBJECT IDENTIFIER ::= { iso org(3) dod(6) 1 }

 directory     OBJECT IDENTIFIER ::= { internet 1 }

 mgmt          OBJECT IDENTIFIER ::= { internet 2 }

 experimental  OBJECT IDENTIFIER ::= { internet 3 }

 private       OBJECT IDENTIFIER ::= { internet 4 }
 enterprises   OBJECT IDENTIFIER ::= { private 1 }


 -- definition of object types

-- MIB Extraction: All MACRO definitions are predefined by compiler
-- commented by MIB Extraction:  OBJECT-TYPE MACRO ::=
-- commented by MIB Extraction:  BEGIN
-- commented by MIB Extraction:      TYPE NOTATION ::= "SYNTAX" type (TYPE ObjectSyntax)
-- commented by MIB Extraction:                        "ACCESS" Access
-- commented by MIB Extraction:                        "STATUS" Status
-- commented by MIB Extraction:      VALUE NOTATION ::= value (VALUE ObjectName)
-- commented by MIB Extraction: 
-- commented by MIB Extraction:      Access ::= "read-only"
-- commented by MIB Extraction:                      | "read-write"
-- commented by MIB Extraction:                      | "write-only"
-- commented by MIB Extraction:                      | "not-accessible"
-- commented by MIB Extraction:      Status ::= "mandatory"
-- commented by MIB Extraction:                      | "optional"
-- commented by MIB Extraction:                      | "obsolete"
-- commented by MIB Extraction:  END

    -- names of objects in the MIB

    ObjectName ::=
        OBJECT IDENTIFIER


    -- syntax of objects in the MIB

    ObjectSyntax ::=
        CHOICE {
            simple
                SimpleSyntax,

    -- note that simple SEQUENCEs are not directly
    -- mentioned here to keep things simple (i.e.,
    -- prevent mis-use).  However, application-wide
    -- types which are IMPLICITly encoded simple
    -- SEQUENCEs may appear in the following CHOICE

            application-wide
                ApplicationSyntax
        }

       SimpleSyntax ::=
           CHOICE {
               number
                   INTEGER,

               string
                   OCTET STRING,

               object
                   OBJECT IDENTIFIER,

               empty
                   NULL
           }

       ApplicationSyntax ::=
           CHOICE {
               address
                   NetworkAddress,

               counter
                   Counter,

               gauge
                   Gauge,

               ticks
                   TimeTicks,

               arbitrary
                   Opaque

       -- other application-wide types, as they are
       -- defined, will be added here
           }


       -- application-wide types

       NetworkAddress ::=
           CHOICE {
               internet
                   IpAddress
           }

       IpAddress ::=
           [APPLICATION 0]          -- in network-byte order
               IMPLICIT OCTET STRING (SIZE (4))

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

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

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

       Opaque ::=
           [APPLICATION 4]          -- arbitrary ASN.1 value,
               IMPLICIT OCTET STRING   --   "double-wrapped"

       END