TRAP/INFORM notification¶
-
pysnmp.hlapi.v1arch.asyncore.
sendNotification
(snmpDispatcher, authData, transportTarget, notifyType, *varBinds, **options)¶ Send SNMP notification.
Based on passed parameters, prepares SNMP TRAP or INFORM notification (RFC 1905#section-4.2.6) and schedules its transmission by I/O framework at a later point of time.
Parameters: snmpDispatcher (
SnmpDispatcher
) – Class instance representing asyncore-based asynchronous event loop and associated state information.authData (
CommunityData
orUsmUserData
) – Class instance representing SNMP credentials.transportTarget (
UdpTransportTarget
or) –Udp6TransportTarget
Class instance representing transport type along with SNMP peer address.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.Besides user variable-bindings, SNMP Notification PDU requires at least two variable-bindings to be present:
- SNMPv2-MIB::sysUpTime.0 = <agent uptime>
- SNMPv2-SMI::snmpTrapOID.0 = <notification ID>
When sending SNMPv1 TRAP, more variable-bindings could be present:
- SNMP-COMMUNITY-MIB::snmpTrapAddress.0 = <agent-IP>
- SNMP-COMMUNITY-MIB::snmpTrapCommunity.0 = <snmp-community-name>
- SNMP-COMMUNITY-MIB::snmpTrapEnterprise.0 = <enterprise-OID>
If user does not supply some or any of the above variable-bindings or if they are at the wrong positions, the system will add/reorder the missing ones automatically.
On top of that, some notification types imply including some additional variable-bindings providing additional details on the event being reported. Therefore it is generally easier to use
NotificationType
object which will help adding relevant variable-bindings.
Other Parameters: **options – Request options:
- lookupMib - load MIB and resolve response MIB variables at the cost of slightly reduced performance. Default is False.
- 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.
Note
The SnmpDispatcher object may be expensive to create, therefore it is advised to maintain it for the lifecycle of the application/thread for as long as possible.
Returns: sendRequestHandle (int) – Unique request identifier. Can be used for matching received responses with ongoing INFORM requests. Returns None for TRAP notifications. Raises: PySnmpError
– Or its derivative indicating that an error occurred while performing SNMP operation.Examples
>>> from pysnmp.hlapi.v1arch.asyncore import * >>> >>> snmpDispatcher = SnmpDispatcher() >>> >>> sendNotification( >>> snmpDispatcher, >>> CommunityData('public'), >>> UdpTransportTarget(('demo.snmplabs.com', 162)), >>> 'trap', >>> NotificationType(ObjectIdentity('SNMPv2-MIB', 'coldStart')), >>> lookupMib=True >>> ) >>> snmpDispatcher.transportDispatcher.runDispatcher()