# How to pass MIB to the Manager

17. How to make use of random MIBs at my Manager application?

1. Starting from PySNMP 4.3.x, plain-text (ASN.1) MIBs can be automatically parsed into PySNMP form by the PySMI tool. PySNMP will call PySMI automatically, parsed PySNMP MIB will be cached in $HOME/.pysnmp/mibs/ (default location).

   MIB compiler could be configured to search for plain-text MIBs at multiple local and remote locations. As for remote MIB repos, you are welcome to use our collection of ASN.1 MIB files at https://github.com/lextudio/mibs.snmplabs.com/tree/master/asn1 as shown below.

    import asyncio
    from pysnmp.hlapi.asyncio import *

    async def run():
        snmpEngine = SnmpEngine()
        get_result = await getCmd(
            snmpEngine,
            CommunityData('public'),
            UdpTransportTarget(('demo.pysnmp.com', 161)),
            ContextData(),
            ObjectType(ObjectIdentity('IF-MIB', 'ifInOctets', 1).addAsn1MibSource('file:///usr/share/snmp',
                                                                                    'https://mibs.pysnmp.com/asn1/@mib@'))
        )

        errorIndication, errorStatus, errorIndex, varBinds = await get_result
        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]))

    asyncio.run(run())

`Download` script.

Alternatively, you can invoke the mibdump.py (shipped with PySMI) by hand and this way compile plain-text MIB into PySNMP format. Once the compiled MIBs are stored in a directory, add the directory to your MibBuilder’s MibSources.

    builder = engine.getMibBuilder()
    # Make ./mibs available to all OIDs that are created
    # e.g. with "MIB-NAME-MIB::identifier"
    builder.addMibSources(builder_module.DirMibSource(
        os.path.join( HERE, 'mibs')
    ))