GETNEXT command

pysnmp.hlapi.v1arch.asyncore.nextCmd(snmpDispatcher, authData, transportTarget, *varBinds, **options)

Initiate SNMP GETNEXT query over SNMPv1/v2c.

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.

Parameters:
  • snmpDispatcher (SnmpDispatcher) – Class instance representing SNMP dispatcher.
  • authData (CommunityData or UsmUserData) – Class instance representing SNMP credentials.
  • transportTarget (UdpTransportTarget or Udp6TransportTarget) – Class instance representing transport type along with SNMP peer address.
  • *varBinds (tuple of OID-value pairs or 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.
  • 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.

Notes

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

  • snmpDispatcher (snmpDispatcher): Class instance representing SNMP dispatcher.
  • stateHandle (int): Unique request identifier. Can be used for matching multiple ongoing requests with received responses.
  • errorIndication (str): True value indicates SNMP dispatcher 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 variable-bindings represented as tuple or 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 (object): Original user-supplied object.
Returns:stateHandle (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.

Examples

>>> from pysnmp.hlapi.v1arch.asyncore import *
>>>
>>> def cbFun(snmpDispatcher, stateHandle, errorIndication,
>>>           errorStatus, errorIndex, varBinds, cbCtx):
>>>     print(errorIndication, errorStatus, errorIndex, varBinds)
>>>
>>> snmpDispatcher = snmpDispatcher()
>>>
>>> stateHandle = nextCmd(
>>>     snmpDispatcher,
>>>     CommunityData('public'),
>>>     UdpTransportTarget(('demo.snmplabs.com', 161)),
>>>     ('1.3.6.1.2.1.1', None),
>>>     cbFun=cbFun
>>> )
>>>
>>> snmpDispatcher.transportDispatcher.runDispatcher()