Various SNMP versions

SNMPv1

Send SNMP GET request using the following options:

  • with SNMPv1, community ‘public’
  • over IPv4/UDP
  • to an Agent at demo.snmplabs.com:161
  • for two instances of SNMPv2-MIB::sysDescr.0 MIB object,
  • based on Twisted I/O framework

Functionally similar to:

$ snmpget -v1 -c public demo.snmplabs.com SNMPv2-MIB::sysDescr.0
from twisted.internet.task import react
from pysnmp.hlapi.twisted import *


def success(args, hostname):
    (errorStatus, errorIndex, varBinds) = args

    if errorStatus:
        print('%s: %s at %s' % (hostname,
                                errorStatus.prettyPrint(),
                                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
    else:
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))


def failure(errorIndication, hostname):
    print('%s failure: %s' % (hostname, errorIndication))


# noinspection PyUnusedLocal
def getSysDescr(reactor, hostname):
    d = getCmd(SnmpEngine(),
               CommunityData('public', mpModel=0),
               UdpTransportTarget((hostname, 161)),
               ContextData(),
               ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0)))

    d.addCallback(success, hostname).addErrback(failure, hostname)

    return d


react(getSysDescr, ['demo.snmplabs.com'])

Download script.

Bulk walk MIB

Send a series of SNMP GETBULK requests using the following options:

  • with SNMPv3, user ‘usr-none-none’, no authentication, no privacy
  • over IPv4/UDP
  • to an Agent at demo.snmplabs.com:161
  • for all OIDs past SNMPv2-MIB::system
  • run till end-of-mib condition is reported by Agent
  • based on Twisted I/O framework

Functionally similar to:

$ snmpbulkwalk -v3 -lnoAuthNoPriv -u usr-none-none -Cn0 -Cr50 demo.snmplabs.com SNMPv2-MIB::system
from twisted.internet.task import react
from pysnmp.hlapi.twisted import *


def success(args, reactor, snmpEngine):
    (errorStatus, errorIndex, varBindTable) = args

    if errorStatus:
        print('%s: %s at %s' % (hostname,
                                errorStatus.prettyPrint(),
                                errorIndex and varBindTable[0][int(errorIndex) - 1][0] or '?'))
    else:
        for varBindRow in varBindTable:
            for varBind in varBindRow:
                print(' = '.join([x.prettyPrint() for x in varBind]))

        if not isEndOfMib(varBindTable[-1]):
            return getbulk(reactor, snmpEngine, *varBindTable[-1])


def failure(errorIndication):
    print(errorIndication)


def getbulk(reactor, snmpEngine, varBinds):
    d = bulkCmd(snmpEngine,
                UsmUserData('usr-none-none'),
                UdpTransportTarget(('demo.snmplabs.com', 161)),
                ContextData(),
                0, 50,
                varBinds)
    d.addCallback(success, reactor, snmpEngine).addErrback(failure)
    return d


react(getbulk, [SnmpEngine(), ObjectType(ObjectIdentity('SNMPv2-MIB', 'system'))])

Download script.

See also: library reference.