GETNEXT command

pysnmp.hlapi.v3arch.asyncore.nextCmd(snmpEngine, authData, transportTarget, contextData, *varBinds, **options)

Performs SNMP GETNEXT query.

Based on passed parameters, prepares SNMP GETNEXT packet (RFC 1905#section-4.2.2) and schedules its transmission by I/O framework at a later point of time.

  • 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.
  • *varBinds (ObjectType) – One or more class instances representing MIB variables to place into SNMP request.
Other Parameters:


Request options:

  • lookupMib - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is True.
  • cbFun (callable) - user-supplied callable that is invoked
    to pass SNMP response data or error to user at a later point of time. Default is None.
  • cbCtx (object) - user-supplied object passing additional
    parameters to/from cbFun. Default is None.


User-supplied cbFun callable must have the following call signature:

  • snmpEngine (SnmpEngine): Class instance representing SNMP engine.
  • sendRequestHandle (int): Unique request identifier. Can be used for matching multiple ongoing requests with received responses.
  • 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]
  • varBinds (tuple): A sequence of sequences (e.g. 2-D array) of ObjectType class instances representing a table of MIB variables returned in SNMP response. Inner sequences represent table rows and ordered exactly the same as varBinds in request. Response to GETNEXT always contain a single row.
  • cbCtx : Original user-supplied object.
Returns:sendRequestHandle (int) – Unique request identifier. Can be used for matching received responses with ongoing requests.
Raises:PySnmpError – Or its derivative indicating that an error occurred while performing SNMP operation.


>>> from pysnmp.hlapi.asyncore import *
>>> def cbFun(snmpEngine, sendRequestHandle, errorIndication, errorStatus, errorIndex, varBinds, cbCtx):
...     print(errorIndication, errorStatus, errorIndex, varBinds)
>>> snmpEngine = SnmpEngine()
>>> nextCmd(snmpEngine,
...         CommunityData('public'),
...         UdpTransportTarget(('', 161)),
...         ContextData(),
...         ObjectType(ObjectIdentity('SNMPv2-MIB', 'system')),
...         cbFun=cbFun)
>>> snmpEngine.transportDispatcher.runDispatcher()
(None, 0, 0, [ [ObjectType(ObjectIdentity(ObjectName('')), DisplayString('SunOS 4.1.3_U1 1 sun4m'))] ])