# GETBULK command

`pysnmp.hlapi.asyncio.``bulkCmd`(snmpEngine, authData, transportTarget, contextData, nonRepeaters, maxRepetitions, *varBinds, **options)

  Creates a generator to perform SNMP GETBULK query.

  When iterator gets advanced by `asyncio` main loop, SNMP GETBULK request is send (RFC 1905#section-4.2.3). The iterator yields `asyncio.Future` which gets done whenever response arrives or error occurs.

  Parameters

    - snmpEngine (`SnmpEngine`) – Class instance representing SNMP engine.

    - authData (`CommunityData` or `UsmUserData`) – Class instance representing SNMP credentials.

    - transportTarget (`UdpTransportTarget` or `Udp6TransportTarget`) – Class instance representing transport type along with SNMP peer address.

    - contextData (`ContextData`) – Class instance representing SNMP ContextEngineId and ContextName values.

    - nonRepeaters (int) – One MIB variable is requested in response for the first nonRepeaters MIB variables in request.

    - maxRepetitions (int) – maxRepetitions MIB variables are requested in response for each of the remaining MIB variables in the request (e.g. excluding nonRepeaters). Remote SNMP engine may choose lesser value than requested.

    - *varBinds (`ObjectType`) – One or more class instances representing MIB variables to place into SNMP request.

  Other Parameters

    **options –

    Request options:

    > - lookupMib - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is True.

  Yields

    - errorIndication (str) – True value indicates SNMP engine error.

    - errorStatus (str) – True value indicates SNMP PDU error.

    - errorIndex (int) – Non-zero value refers to varBinds[errorIndex-1]

    - varBindTable (tuple) – A sequence of sequences (e.g. 2-D array) of `ObjectType` class instances representing a table of MIB variables returned in SNMP response, with up to `maxRepetitions` rows, i.e. `len(varBindTable) <= maxRepetitions`.

      For `0 <= i < len(varBindTable)` and `0 <= j < len(varBinds)`, `varBindTable[i][j]` represents:

      - For non-repeaters (`j < nonRepeaters`), the first lexicographic successor of `varBinds[j]`, regardless the value of `i`, or an `ObjectType` instance with the `endOfMibView` value if no such successor exists;

      - For repeaters (`j >= nonRepeaters`), the `i`-th lexicographic successor of `varBinds[j]`, or an `ObjectType` instance with the `endOfMibView` value if no such successor exists.

      See RFC 3416#section-4.2.3 for details on the underlying `GetBulkRequest-PDU` and the associated `GetResponse-PDU`, such as specific conditions under which the server may truncate the response, causing `varBindTable` to have less than `maxRepetitions` rows.

  Raises

    PySnmpError – Or its derivative indicating that an error occurred while performing SNMP operation.

  Examples

      >>> import asyncio
      >>> from pysnmp.hlapi.asyncio import *
      >>>
      >>> @asyncio.coroutine
      ... def run():
      ...     errorIndication, errorStatus, errorIndex, varBinds = yield from bulkCmd(
      ...         SnmpEngine(),
      ...         CommunityData('public'),
      ...         UdpTransportTarget(('demo.snmplabs.com', 161)),
      ...         ContextData(),
      ...         0, 2,
      ...         ObjectType(ObjectIdentity('SNMPv2-MIB', 'system'))
      ...     )
      ...     print(errorIndication, errorStatus, errorIndex, varBinds)
      >>>
      >>> asyncio.get_event_loop().run_until_complete(run())
      (None, 0, 0, [[ObjectType(ObjectIdentity(ObjectName('1.3.6.1.2.1.1.1.0')), DisplayString('SunOS zeus.snmplabs.com 4.1.3_U1 1 sun4m'))], [ObjectType(ObjectIdentity(ObjectName('1.3.6.1.2.1.1.2.0')), ObjectIdentifier('1.3.6.1.4.1.424242.1.1'))]])
      >>>