Re: [pysnmp-users] Custom MIB files

[Jian Li <ji...@le...>]

Ilya,

Some more info for the mibdump.py issue I am experiencing.

This is the MIB I am trying to modify with a local MIB text file, mibs.snmplabs.com/asn1/PACKETPOWER-EG4-MIB.
When I do mibdump.py --rebuild /local-directory/PACKKETPOWER-EG4-MIB.txt it always takes the content from the online PACKETPOWER-EG4-MIB without any modifications in my local MIB text file ( I was trying to add more constraint values for channelId in that file) to the generated ~/.pysnmp/mibs/PACKETPOWER-EG4-MIB.py

So, how did PACKETPOWER-EG4-MI get online? Is it possible to either delete or modify it?

Thanks,

Jian

-----Original Message-----
From: Ilya Etingof [mailto:il...@gl...]
Sent: Saturday, December 3, 2016 7:39 AM
To: Jian Li
Cc: pys...@li...
Subject: Re: [pysnmp-users] Custom MIB files


My guess is that once you compiled MIB into .py form, you should make pysnmp using it by either:

*  moving your .py MIB into ~/.pysnmp/mibs or
* configuring pysnmp to pick up .py MIBs from a non-default location (http://pysnmp.sourceforge.net/docs/api-reference.html#pysnmp.smi.rfc1902.ObjectIdentity.addMibSource).

MIB files at snmplabs.com serve as a shared, community repository of originally ASN.1 MIB files, there should be no need to remove them.

> On 02 Dec 2016, at 22:41, Jian Li <ji...@le...<mailto:ji...@le...>> wrote:
>
> Ilya,
>
> I modified my mib file and did a "mibdump.py --rebuild" with the
> modified mib file. But the generated python file did not take the
> modifications ( I am using ubuntu14.04 with python 2.7). Do I need to
> somehow delete the one online as well,
> http://mibs.snmplabs.com:80/asn1/PACKETPOWER-EG4-MIB
>
> Thanks,
>
> Jian
>
> -----Original Message-----
> From: Ilya Etingof [mailto:il...@gl...]
> Sent: Thursday, November 17, 2016 5:45 PM
> To: Jian Li
> Cc: pys...@li...<mailto:pys...@li...>
> Subject: Re: [pysnmp-users] Custom MIB files
>
>
> I could not compile your MIB because it seems to import both SMIv1 and SMIv2 types. Once I changed the SMIv1 IMPORTS:
>
>     DisplayString
>                        FROM RFC1213-MIB
>
> for SMIv2 ones:
>
>     DateAndTime, DisplayString, RowStatus, TruthValue, DisplayString
>                        FROM SNMPv2-TC
>
> It compiled successfully.
>
> As for your other question — your code looks OK for as long as you actually iterate the generator you’ve created because this is when actual I/O happens:
>
>    gen = nextCmd(…)
>    for rsp in gen:
>        print(rsp)
>
> And SNMP agent at 169.254.81.145 is responding. You may also debug your script against public SNMP simulator:
>
>   http://snmpsim.sourceforge.net/public-snmp-simulator.html
>
> Though it does not implement your MIB.
>
>> On 17 Nov 2016, at 22:18, Jian Li <ji...@le...<mailto:ji...@le...>> wrote:
>>
>> Ilya,
>>
>> Please find the attached MIB file. Thank you very much for your help.
>>
>> I was able to use mibdump.py to compile that MIB file to python
>> modules. There is another question I want to ask you about pysnmp as
>> well, I did not get any response for the following command, do I do
>> something obviously wrong? The snmp agent is configured and I was
>> able to get correct response for ObjectIdentity('SNMPv2-MIB',
>> 'system')
>>
>>  nextCmd(SnmpEngine(),
>>                                     CommunityData('public', mpModel=1),
>>                                     UdpTransportTarget(('169.254.81.145', 161)),
>>                                     ContextData(),
>>                                     ObjectType(ObjectIdentity('
>> PACKETPOWER-EG4-MIB, ' packetPower'))
>>
>> Thanks,
>>
>> Jian
>>
>> -----Original Message-----
>> From: Ilya Etingof [mailto:il...@gl...]
>> Sent: Thursday, November 17, 2016 3:08 PM
>> To: Jian Li
>> Cc: pys...@li...<mailto:pys...@li...>
>> Subject: Re: [pysnmp-users] Custom MIB files
>>
>>
>> Could you please share your MIB (e.g. CUSTOM-EG4-MIB)? I suspect it has syntax errors, in particular it may miss SNMPv2-SMI import.
>>
>>> On 15 Nov 2016, at 16:34, Jian Li <ji...@le...<mailto:ji...@le...>> wrote:
>>>
>>> I tried to add the MIB files to a python script, using PySNMP
>>> addAsn1MibSource(‘file:///path’). However I got the following error,
>>>
>>> pysnmp.smi.error.MibNotFoundError: CUSTOM-EG4-MIB compilation
>>> error(s): missing; missing; missing; missing; no module "SNMPv2-SMI"
>>> in symbolTable at MIB CUSTOM-EG4-MIB
>>>
>>> Would really appreciate your help to get it resolved.
>>>
>>> Thanks,
>>>
>>> Jian
>> <PACKETPOWER-EG4-MIB>
>