Walking operations

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.v3arch.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):
    deferred = bulkCmd(
        snmpEngine,
        UsmUserData('usr-none-none'),
        UdpTransportTarget(('demo.snmplabs.com', 161)),
        ContextData(),
        0, 50,
        varBinds
    )

    deferred.addCallback(success, reactor, snmpEngine).addErrback(failure)

    return deferred


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

Download script.

Walk whole MIB

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

• with SNMPv3, user ‘usr-md5-none’, MD5 authentication, no privacy
• over IPv4/UDP
• to an Agent at demo.snmplabs.com:161
• for all OIDs in IF-MIB
• based on Twisted I/O framework

Functionally similar to:

$ snmpwalk -v3 -lauthPriv -u usr-md5-none -A authkey1 -X privkey1 demo.snmplabs.com IF-MIB::

from twisted.internet.task import react
from pysnmp.hlapi.v3arch.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 getnext(reactor, snmpEngine, *varBindTable[-1])


def failure(errorIndication):
    print(errorIndication)


def getnext(reactor, snmpEngine, varBinds):
    deferred = nextCmd(
        snmpEngine,
        UsmUserData('usr-md5-none', 'authkey1'),
        UdpTransportTarget(('demo.snmplabs.com', 161)),
        ContextData(),
        varBinds
    )

    deferred.addCallback(success, reactor, snmpEngine).addErrback(failure)

    return deferred


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

Download script.

See also: library reference.