Resolve response values at MIB

  1. My CommandGenerator app reports OIDs and values in form of PyASN1 objects. How do I convert them into human-readable, symbolic names and values?

  1. The most easy to use interface to MIB lookup feature is supported by PySNMP 4.2.3 and later. Just pass the

lookupNames=True, lookupValues=True

parameters to getCmd(), setCmd(), nextCmd(), bulkCmd() methods of oneliner CommandGenerator. Then the OIDs in response variable-binding list will get replaced by similarily looking MibVariable instances, their prettyPrint() methods return MIB symbols instead of OIDs.

Response values will still be PyASN1 objects but some may be replaced by TEXTUAL-CONVENTION decorators what make their prettyPrint() methods returning even more human-friendly output.

>>> from pysnmp.entity.rfc3413.oneliner import cmdgen
>>>
>>> cmdGen = cmdgen.CommandGenerator()
>>>
>>> errorIndication, errorStatus, errorIndex, varBinds = cmdGen.getCmd(
...     cmdgen.CommunityData('public'),
...     cmdgen.UdpTransportTarget(('localhost', 161)),
...     '1.3.6.1.2.1.1.1.0',
...     lookupNames=True, lookupValues=True
... )
>>>
>>> name, value = varBinds[0]
>>> name
MibVariable(ObjectName(1.3.6.1.2.1.1.1.0))
>>> value
DisplayString('Linux saturn 2.6.38.1 Sat Apr 9 23:39:07 CDT 2012 i686')
>>> name.prettyPrint()
'SNMPv2-MIB::sysDescr."0"'
>>> value.prettyPrint()
'Linux cray 2.6.37.6-smp #2 SMP Sat Apr 9 23:39:07 CDT 2011 i686'
>>>

If you are using older PySNMP versions it’s strongly recommended to upgrade to the latest one.