Modifying variables

Coerce value to SET to MIB spec

Send SNMP SET request using the following options:

  • with SNMPv2c, community ‘public’
  • over IPv4/UDP
  • to an Agent at demo.snmplabs.com:161
  • with MIB lookup enabled
  • setting SNMPv2-MIB::sysName.0 to new value (type taken from MIB)

Functionally similar to:

$ snmpset -v2c -c public demo.snmplabs.com SNMPv2-MIB::sysDescr.0 = “new system name”
from pysnmp.hlapi.v1arch import *

iterator = setCmd(
    SnmpDispatcher(),
    CommunityData('public'),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysORDescr', 1), 'new description'),
    lookupMib=True
)

errorIndication, errorStatus, errorIndex, varBinds = next(iterator)

if errorIndication:
    print(errorIndication)

elif errorStatus:
    print('%s at %s' % (errorStatus.prettyPrint(),
                        errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))

else:
    for varBind in varBinds:
        print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

SET scalars values

Send SNMP SET request using the following options:

  • with SNMPv1, community ‘public’
  • over IPv4/UDP
  • to an Agent at demo.snmplabs.com:161
  • with MIB lookup enabled
  • setting three var-bindings to new values

Please note, that in this example MIB lookup is only used for the second var-bindins. For the rest, value types are inferred from passed objects.

Functionally similar to:

$ snmpset -v1 -c public demo.snmplabs.com 1.3.6.1.2.1.1.9.1.2.1 o 1.3.6.1.4.1.20408.1.1 1.3.6.1.2.1.1.9.1.2.1 = 1.3.6.1.4.1.20408.1.1 1.3.6.1.2.1.1.9.1.3.1 s “new system name”
from pysnmp.hlapi.v1arch import *

iterator = setCmd(
    SnmpDispatcher(),
    CommunityData('public', mpModel=0),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ObjectType(
        ObjectIdentity('SNMPv2-MIB', 'sysORID', 1),
        ObjectIdentifier('1.3.6.1.4.1.20408.1.1')
    ),
    ObjectType(
        ObjectIdentity('1.3.6.1.2.1.1.9.1.2.1'),
        '1.3.6.1.4.1.20408.1.1'
    ),
    ObjectType(
        ObjectIdentity('1.3.6.1.2.1.1.9.1.3.1'),
        OctetString('new system name')
    ),
    lookupMib=True
)


errorIndication, errorStatus, errorIndex, varBinds = next(iterator)

if errorIndication:
    print(errorIndication)

elif errorStatus:
    print('%s at %s' % (errorStatus.prettyPrint(),
                        errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))

else:
    for varBind in varBinds:
        print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

See also: library-reference.