Re: [pysnmp-users] PySNMP 4.3.1 strange prettyPrint() output

[Ilya E. <il...@gl...>]

Hi Wei,

You need to pre-load MIBs that your agent implements and is likely to refer to in its responses. That can be done by adding ObjectType.loadMibs(‘YOUR-MIB1.txt’, ‘YOUR-MIB2.txt’) like this:

http://pysnmp.sourceforge.net/examples/hlapi/asyncore/sync/manager/cmdgen/mib-tweaks.html#preload-pysnmp-mibs <http://pysnmp.sourceforge.net/examples/hlapi/asyncore/sync/manager/cmdgen/mib-tweaks.html#preload-pysnmp-mibs>

-ilya

> On 17 Nov 2015, at 22:38, Wei Wang <ww...@9r...> wrote:
> 
> Hi, list,
> 
> Thanks to the help from Ilya, I got my code to work with the latest pysnmp.
> 
> But I am seeing some strange output from prettyPrint() with this function:
> 
> @trollius.coroutine
> def walk_aptable(wlc, cfg, varBinds):
>     snmp = SnmpEngine()
>     timeout = cfg['timeout']
>     retries = cfg['retries']
>     authData = CommunityData(cfg['community'])
>     transportTarget = cmdgen.UdpTransportTarget((wlc, 161), timeout=timeout, retries=retries)
>     logger.debug('walk_aptable: {0}'.format(wlc))
>     while True:
>         errorIndication, errorStatus, errorIndex,\
>         varBindTable = yield trollius.From(
>             cmdgen.bulkCmd(
>                 snmp,
>                 authData,
>                 transportTarget,
>                 ContextData(),
>                 0, 50,
>                 *varBinds,
>                 lookupNames=True, lookupValues=True
>                 )
>             )
> 
>         if errorIndication:
>             logger.error('{0}: {1}'.format(transportTarget, errorIndication))
>             break
>         if errorStatus:
>             logger.error(
>                 '{0} at {1}'.format(
>                     errorStatus.prettyPrint(),
>                     errorIndex and varBindTable[-1][int(errorIndex)-1] or '?'
>                     )
>                 )
>         else:
>             for varBindRow in varBindTable:
>                 for varBind in varBindRow:
>                     logger.debug('{0}: {1}'.format(
>                             transportTarget.getTransportInfo()[1][0], # IP address
>                             ' = '.join([ x.prettyPrint() for x in varBind ])
>                             )
>                     )
>         varBinds = varBindTable[-1]
>         if isEndOfMib(varBinds):
>             break
>     #snmp.transportDispatcher.closeDispatcher()
> 
> That function is called like this:
> 
>         varbinds = [ ObjectType(ObjectIdentity('AIRESPACE-WIRELESS-MIB', 'bsnAPTable'))]
>         loop = trollius.get_event_loop()
>         loop.run_until_complete(
>             trollius.wait([walk_aptable(wlc, cfg, varbinds) for wlc in wlcs]))
> 
> with 2 IP addresses in the "wlcs" list.
> 
> The output is that the MIB object names from one device unresolved, like this:
> 
> 2015-11-17 16:21:03,794 DEBUG ap.walk_aptable:199 10.50.0.12 <http://10.50.0.12/>: SNMPv2-SMI::enterprises.14179.2.2.1.1.1.0.20.27.88.56.240 = 0x00141b5838f0
> 
> with the same object names from another device resolved, like this:
> 
> 2015-11-17 16:21:03,865 DEBUG ap.walk_aptable:199 10.50.0.13 <http://10.50.0.13/>: AIRESPACE-WIRELESS-MIB::bsnAPDot3MacAddress.00:08:30:00:76:10 = 00:08:30:00:76:10
> 
> What am I doing wrong?
> 
> Thanks for any help!
> -- 
> Wei Wang