# 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.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.

## 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.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):
        d = nextCmd(snmpEngine,
                    UsmUserData('usr-md5-none', 'authkey1'),
                    UdpTransportTarget(('demo.snmplabs.com', 161)),
                    ContextData(),
                    varBinds)
        d.addCallback(success, reactor, snmpEngine).addErrback(failure)
        return d

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

`Download` script.

See also: library reference.