How to get value mac and vlan from fdb table uses python?
In bash snmpwalk work fine:
snmpwalk -v2c -c pub 192.168.0.100 1.3.6.1.2.1.17.7.1.2.2.1.2
pysnmp:
import os, sys
import socket
import random
from struct import pack, unpack
from datetime import datetime as dt
from pysnmp.entity.rfc3413.oneliner import cmdgen
from pysnmp.proto.rfc1902 import Integer, IpAddress, OctetString
ip='192.168.0.100'
community='pub'
value=(1,3,6,1,2,1,17,7,1,2,2,1,2)
generator = cmdgen.CommandGenerator()
comm_data = cmdgen.CommunityData('server', community, 1) # 1 means version SNMP v2c
transport = cmdgen.UdpTransportTarget((ip, 161))
real_fun = getattr(generator, 'getCmd')
res = (errorIndication, errorStatus, errorIndex, varBinds)\
= real_fun(comm_data, transport, value)
if not errorIndication is None or errorStatus is True:
print "Error: %s %s %s %s" % res
else:
print "%s" % varBinds
output: [(ObjectName(1.3.6.1.2.1.17.7.1.2.2.1.2), NoSuchInstance(''))]
import netsnmp
def getmac():
oid = netsnmp.VarList(netsnmp.Varbind('.1.3.6.1.2.1.17.7.1.2.2.1.2'))
res = netsnmp.snmpgetbulk(oid, Version = 2, DestHost='192.168.0.100',
Community='pub')
return res
print getmac()
output: ('27', '27', '25', '27', '27', '27', '24', '27', '25', '18', '4', '27', '25', '27', '27', '25', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '23', '25', '27', '27', '27', '25', '27', '25', '27', '27', '25', '27', '27', '27', '27', '27', '27', '27', '27', '27', '25', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '25', '25', '25', '7', '27', '27', '9', '25', '27', '20', '19', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '11', '25', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '27', '25', '27', '27', '27', '27', '27', '27', '27', '27', '27', '2', '27', '5', '27', '0', '27', '27', '27', '27', '27')
Firs script(pysnmp) return NoSuchInstance. Second script(netsnmp) return list of ports but without mac and vlan. What wrong?
In the pysnmp example you are doing an SNMPGET (snmpget), not a GETNEXT (snmpwalk). If you change,
real_fun = getattr(generator, 'getCmd')
to
real_fun = getattr(generator, 'nextCmd')
you will start to see useful results.
As for the discrepancy you saw in the results between snmpwalk
and the python net-snmp
bindings result: snmpwalk
and snmpbulkget
behave differently. If you do an snmpbulkget
from the command line with the same options as the snmpwalk
you'll receive the same results as your python net-snmp
example.
If you update the following line in your python net-snmp
example,
res = netsnmp.snmpgetbulk(oid, Version=2, DestHost='192.168.0.100',
Community='pub')
to
res = netsnmp.snmpwalk(oid, Version=2, DestHost='192.168.0.100',
Community='pub')
then you should now get the same list of results from the python net-snmp
example as you see when you do an snmpwalk
on the command line.