TRAP/INFORM notification¶
-
pysnmp.hlapi.v3arch.twisted.
sendNotification
(snmpEngine, authData, transportTarget, contextData, notifyType, *varBinds, **options)¶ Sends SNMP notification.
Based on passed parameters, prepares SNMP TRAP or INFORM message (RFC 1905#section-4.2.6) and schedules its transmission by
twisted
I/O framework at a later point of time.Parameters: snmpEngine (
SnmpEngine
) – Class instance representing SNMP engine.authData (
CommunityData
orUsmUserData
) – Class instance representing SNMP credentials.transportTarget (
UdpTransportTarget
orUdp6TransportTarget
) – Class instance representing transport type along with SNMP peer address.contextData (
ContextData
) – Class instance representing SNMP ContextEngineId and ContextName values.notifyType (str) – Indicates type of notification to be sent. Recognized literal values are trap or inform.
*varBinds (
tuple
of OID-value pairs orObjectType
orNotificationType
) – One or more objects representing MIB variables to place into SNMP notification. It could be tuples of OID-values orObjectType
class instances ofNotificationType
objects.SNMP Notification PDU includes some housekeeping items that are required for SNMP to function.
Agent information:
- SNMPv2-MIB::sysUpTime.0 = <agent uptime>
- SNMPv2-SMI::snmpTrapOID.0 = {SNMPv2-MIB::coldStart, …}
Applicable to SNMP v1 TRAP:
- SNMP-COMMUNITY-MIB::snmpTrapAddress.0 = <agent-IP>
- SNMP-COMMUNITY-MIB::snmpTrapCommunity.0 = <snmp-community-name>
- SNMP-COMMUNITY-MIB::snmpTrapEnterprise.0 = <enterprise-OID>
Note
Unless user passes some of these variable-bindings, .sendNotification() call will fill in the missing items.
User variable-bindings:
- SNMPv2-SMI::NOTIFICATION-TYPE
- SNMPv2-SMI::OBJECT-TYPE
Note
The
NotificationType
object ensures properly formed SNMP notification (to comply MIB definition). If you build notification PDU out ofObjectType
objects or simple tuples of OID-value objects, it is your responsibility to provide well-formed notification payload.
Other Parameters: **options –
Request options:
- lookupMib - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is True.
Returns: deferred (
Deferred
) – Twisted Deferred object representing work-in-progress. User is expected to attach his own success and error callback functions to the Deferred object thoughaddCallbacks()
method.Raises: PySnmpError
– Or its derivative indicating that an error occurred while performing SNMP operation.Notes
User success callback is called with the following tuple as its first argument:
- errorStatus (str) : True value indicates SNMP PDU error.
- errorIndex (int) : Non-zero value refers to varBinds[errorIndex-1]
- varBinds (tuple) : A sequence of
ObjectType
class instances representing MIB variables returned in SNMP response.
User error callback is called with errorIndication object wrapped in
Failure
object.Examples
>>> from twisted.internet.task import react >>> from pysnmp.hlapi.twisted import * >>> >>> def success(args): ... (errorStatus, errorIndex, varBinds) = args ... print(errorStatus, errorIndex, varBind) ... >>> def failure(errorIndication): ... print(errorIndication) ... >>> def run(reactor): ... d = sendNotification(SnmpEngine(), ... CommunityData('public'), ... UdpTransportTarget(('demo.snmplabs.com', 162)), ... ContextData(), ... 'trap', ... NotificationType(ObjectIdentity('IF-MIB', 'linkDown'))) ... d.addCallback(success).addErrback(failure) ... return d ... >>> react(run) (0, 0, [])