# Multiple managers operations

SNMPv3 framework is designed to allow Agents sending the same PDU to multiple Managers over different network transports, listening at different network addresses over different SNMP versions/credentials.

The following few examples use this facility.

## Notification to multiple addresses

Send SNMP TRAP notifications to multiple Managers using different security settings:

- SNMPv2c

- with community name ‘public’

- over IPv4/UDP

- send TRAP notification

- to multiple Managers at 104.236.166.95:162, 104.236.166.95:162

- with TRAP ID ‘coldStart’ specified as an OID

- include managed objects information: 1.3.6.1.2.1.1.1.0 = ‘Example Notificator’ 1.3.6.1.2.1.1.5.0 = ‘Notificator Example’

Functionally similar to:

$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’
$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’
$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’

    from pysnmp.entity import engine, config
    from pysnmp.carrier.asyncore.dgram import udp
    from pysnmp.entity.rfc3413 import ntforg
    from pysnmp.proto.api import v2c

    # Create SNMP engine instance
    snmpEngine = engine.SnmpEngine()

    # SecurityName <-> CommunityName mapping
    config.addV1System(snmpEngine, 'my-area', 'public', transportTag='all-my-managers')

    # Specify security settings per SecurityName (SNMPv2c -> 1)
    config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 1)

    # Setup transport endpoint and bind it with security settings yielding
    # a target name
    config.addTransport(
        snmpEngine,
        udp.domainName,
        udp.UdpSocketTransport().openClientMode()
    )
    # First target
    config.addTargetAddr(
        snmpEngine, 'my-nms-1',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )
    # Second target
    config.addTargetAddr(
        snmpEngine, 'my-nms-2',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )
    # Third target
    config.addTargetAddr(
        snmpEngine, 'my-nms-3',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )

    # Specify what kind of notification should be sent (TRAP or INFORM),
    # to what targets (chosen by tag) and what filter should apply to
    # the set of targets (selected by tag)
    config.addNotificationTarget(
        snmpEngine, 'my-notification', 'my-filter', 'all-my-managers', 'trap'
    )

    # Allow NOTIFY access to Agent's MIB by this SNMP model (2), securityLevel
    # and SecurityName
    config.addContext(snmpEngine, '')
    config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (), (), (1, 3, 6))

    # *** SNMP engine configuration is complete by this line ***

    # Create Notification Originator App instance.
    ntfOrg = ntforg.NotificationOriginator()

    # Build and submit notification message to dispatcher
    ntfOrg.sendVarBinds(
        snmpEngine,
        # Notification targets
        'my-notification',  # notification targets
        None, '',  # contextEngineId, contextName
        # var-binds
        [
            # SNMPv2-SMI::snmpTrapOID.0 = SNMPv2-MIB::coldStart
            ((1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0), v2c.ObjectIdentifier((1, 3, 6, 1, 6, 3, 1, 1, 5, 1))),
            # additional var-binds: ( (oid, value), ... )
            ((1, 3, 6, 1, 2, 1, 1, 1, 0), v2c.OctetString('Example Notificator')),
            ((1, 3, 6, 1, 2, 1, 1, 5, 0), v2c.OctetString('Notificator Example'))
        ]
    )

    print('Notifications are scheduled to be sent')

    # Run I/O dispatcher which would send pending message and process response
    snmpEngine.transportDispatcher.runDispatcher()

`Download` script.

## Notification to multiple SNMP managers

Send SNMP TRAP notifications to multiple Managers using the following options:

- SNMPv2c

- with community name ‘public’

- over IPv4/UDP

- send TRAP notification

- to multiple Managers at 104.236.166.95:162, 104.236.166.95:162

- with TRAP ID ‘coldStart’ specified as an OID

- include managed objects information: 1.3.6.1.2.1.1.1.0 = ‘Example Notificator’ 1.3.6.1.2.1.1.5.0 = ‘Notificator Example’

Functionally similar to:

$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’
$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’
$ snmptrap -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’ 1.3.6.1.2.1.1.5.0 s ‘Notificator Example’

    from pysnmp.entity import engine, config
    from pysnmp.carrier.asyncore.dgram import udp
    from pysnmp.entity.rfc3413 import ntforg
    from pysnmp.proto.api import v2c

    # Create SNMP engine instance
    snmpEngine = engine.SnmpEngine()

    # SecurityName <-> CommunityName mapping
    config.addV1System(snmpEngine, 'my-area', 'public', transportTag='all-my-managers')

    # Specify security settings per SecurityName (SNMPv2c -> 1)
    config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 1)

    # Setup transport endpoint and bind it with security settings yielding
    # a target name
    config.addTransport(
        snmpEngine,
        udp.domainName,
        udp.UdpSocketTransport().openClientMode()
    )
    # First target
    config.addTargetAddr(
        snmpEngine, 'my-nms-1',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )
    # Second target
    config.addTargetAddr(
        snmpEngine, 'my-nms-2',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )
    # Third target
    config.addTargetAddr(
        snmpEngine, 'my-nms-3',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds',
        tagList='all-my-managers'
    )

    # Specify what kind of notification should be sent (TRAP or INFORM)
    # to what targets (chosen by tag) and with what credentials.
    config.addNotificationTarget(
        snmpEngine, 'my-notification', 'my-creds', 'all-my-managers', 'trap'
    )

    # Allow NOTIFY access to Agent's MIB by this SNMP model (2), securityLevel
    # and SecurityName
    config.addContext(snmpEngine, '')
    config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (), (), (1, 3, 6))

    # *** SNMP engine configuration is complete by this line ***

    # Create Notification Originator App instance.
    ntfOrg = ntforg.NotificationOriginator()

    # Build and submit notification message to dispatcher
    ntfOrg.sendVarBinds(
        snmpEngine,
        # Notification targets
        'my-notification',  # notification targets
        None, '',  # contextEngineId, contextName
        # var-binds
        [
            # SNMPv2-SMI::snmpTrapOID.0 = SNMPv2-MIB::coldStart
            ((1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0), v2c.ObjectIdentifier((1, 3, 6, 1, 6, 3, 1, 1, 5, 1))),
            # additional var-binds: ( (oid, value), ... )
            ((1, 3, 6, 1, 2, 1, 1, 1, 0), v2c.OctetString('Example Notificator')),
            ((1, 3, 6, 1, 2, 1, 1, 5, 0), v2c.OctetString('Notificator Example'))
        ]
    )

    print('Notifications are scheduled to be sent')

    # Run I/O dispatcher which would send pending message and process response
    snmpEngine.transportDispatcher.runDispatcher()

`Download` script.

## Notification over multiple SNMP versions

Send SNMP INFORM notifications to multiple Managers using different security settings:

- SNMPv2c

- with community name ‘public’

- AND

- SNMPv3

- with user ‘usr-md5-none’, auth: MD5, priv NONE

- over IPv4/UDP

- send INFORM notification

- to multiple Managers at 104.236.166.95:162, 104.236.166.95:162

- with TRAP ID ‘coldStart’ specified as an OID

- include managed objects information: 1.3.6.1.2.1.1.1.0 = ‘Example Notificator’

Functionally similar to:

$ snmpinform -v3 -l authPriv -u usr-md5-none -A authkey1 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’
$ snmpinform -v2c -c public 104.236.166.95 0 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.1.0 s ‘Example notification’

    from pysnmp.entity import engine, config
    from pysnmp.carrier.asyncore.dgram import udp
    from pysnmp.entity.rfc3413 import ntforg
    from pysnmp.proto.api import v2c

    # Create SNMP engine instance
    snmpEngine = engine.SnmpEngine()

    # SNMPv2c:

    # SecurityName <-> CommunityName mapping
    config.addV1System(snmpEngine, 'my-area', 'public', transportTag='all-my-managers')

    # Specify security settings per SecurityName (SNMPv2c -> 1)
    config.addTargetParams(snmpEngine, 'my-creds-1', 'my-area', 'noAuthNoPriv', 1)

    # SNMPv3:

    config.addV3User(
        snmpEngine, 'usr-md5-none',
        config.usmHMACMD5AuthProtocol, 'authkey1'
    )
    config.addTargetParams(snmpEngine, 'my-creds-2', 'usr-md5-none', 'authNoPriv')

    # Setup transport endpoint and bind it with security settings yielding
    # a target name
    config.addTransport(
        snmpEngine,
        udp.domainName,
        udp.UdpSocketTransport().openClientMode()
    )
    # First target
    config.addTargetAddr(
        snmpEngine, 'my-nms-1',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds-1',
        tagList='all-my-managers'
    )
    # Second target
    config.addTargetAddr(
        snmpEngine, 'my-nms-2',
        udp.domainName, ('104.236.166.95', 162),
        'my-creds-2',
        tagList='all-my-managers'
    )

    # Specify what kind of notification should be sent (TRAP or INFORM),
    # to what targets (chosen by tag) and what filter should apply to
    # the set of targets (selected by tag)
    config.addNotificationTarget(
        snmpEngine, 'my-notification', 'my-filter', 'all-my-managers', 'inform'
    )

    # Allow NOTIFY access to Agent's MIB by this SNMP model (2&3), securityLevel
    # and SecurityName
    config.addContext(snmpEngine, '')
    config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (), (), (1, 3, 6))
    config.addVacmUser(snmpEngine, 3, 'usr-md5-none', 'authNoPriv', (), (), (1, 3, 6))

    # *** SNMP engine configuration is complete by this line ***

    # Create Notification Originator App instance.
    ntfOrg = ntforg.NotificationOriginator()

    # Error/confirmation receiver
    # noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
    def cbFun(snmpEngine, sendRequestHandle, errorIndication,
              errorStatus, errorIndex, varBinds, cbCtx):
        print('Notification %s, status - %s' % (sendRequestHandle,
                                                errorIndication and errorIndication or 'delivered'))

    # Build and submit notification message to dispatcher
    sendRequestHandle = ntfOrg.sendVarBinds(
        snmpEngine,
        'my-notification',  # notification targets
        None, '',  # contextEngineId, contextName
        # var-binds
        [
            # SNMPv2-SMI::snmpTrapOID.0 = SNMPv2-MIB::coldStart
            ((1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0), v2c.ObjectIdentifier((1, 3, 6, 1, 6, 3, 1, 1, 5, 1))),
            # additional var-binds: ( (oid, value), ... )
            ((1, 3, 6, 1, 2, 1, 1, 1, 0), v2c.OctetString('Example Notificator'))
        ],
        cbFun
    )

    print('Notifications %s are scheduled to be sent' % sendRequestHandle)

    # Run I/O dispatcher which would send pending message and process response
    snmpEngine.transportDispatcher.runDispatcher()

`Download` script.

See also: library reference.