Not returning correct MIB for sysObjectID OID

[faysal-ishtiaq]

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Consider the following block of code:

from pysnmp.smi import builder, view, compiler, error, instrum
from pysnmp.proto.rfc3412 import MsgAndPduDispatcher
from pysnmp.hlapi import *

mib_builder = builder.MibBuilder()
mib_builder.addMibSources(builder.DirMibSource('/path/to/compiled/mibs/'))
engine = SnmpEngine(msgAndPduDsp=MsgAndPduDispatcher(mibInstrumController=instrum.MibInstrumController(mib_builder)))

oid = ObjectIdentity("SNMPv2-MIB", "sysObjectID")
for (errorIndication,
     errorStatus,
     errorIndex,
     varBinds) in nextCmd(
        self.engine,
        CommunityData('public', mpModel=1),
        UdpTransportTarget(('192.168.0.222', 161)),
        ContextData(),
        ObjectType(oid),
        lexicographicMode=False
):

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

It should return correct MIB for sysObjectID. But it returns, SNMPv2-MIB::sysObjectID.0 = SNMPv2-SMI::enterprises.9.1.1047

then I tried,

for varBind in varBinds:
   print(varBind)
   if type(varBind[1]) == type(oid):
       _oid, label, suffix = view.MibViewController(mib_builder).getNodeName(varBind[1].getOid())
       print(_oid, label, suffix)

which returns

SNMPv2-MIB::sysObjectID.0 = SNMPv2-SMI::enterprises.9.1.1047
1.3.6.1.4.1 ('iso', 'org', 'dod', 'internet', 'private', 'enterprises') 9.1.1047

The correct MIB resides in CISCO-PRODUCTS-MIB and I have it compiled.

So, what can I do to get correct MIB for sysObjectID?

[lextm]

I can reproduce this issue and a workaround is to add a call to force load the Cisco module,

mib_builder.loadModule('CISCO-PRODUCTS-MIB')

But about why PySNMP does not load the module automatically, more investigation is required.