How to get ipRouteTable from Cisco router?

gvozdikov t1k0v.sk0s at gmail.com
Thu Apr 29 17:12:20 CEST 2010


Hello!

I want to get route tables from Cisco routers in the network. What i
have:

import re

from pysnmp.entity.rfc3413.oneliner import cmdgen

s = r'(%s)' % ('(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.)\
{3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)')
pattern = re.compile(s)
file = 'routers.txt'
s = open(file).read()
i = 0
router_list = []
while True:
    match = pattern.search(s, i)
    if match:
        router_list.append(match.group(1))
        i = match.end() + 1
    else:
        break

class router:
    def __init__(self, who):
        self.name = who

    routetable = {}

router1 = router(router_list[0])

cmdGen = cmdgen.CommandGenerator()
errorIndication, errorStatus, errorIndex, varBindTable =
cmdGen.nextCmd(
    cmdgen.CommunityData('test-agent', public, 0),
    cmdgen.UdpTransportTarget((router1.name, 161)),
    (1,3,6,1,2,1,4,21,1,1))

if errorIndication:
        print errorIndication
else:
    if errorStatus:
            print '%s at %s\n' %
(errorStatus.prettyPrint(),varBindTable[-1][int(errorIndex)-1])
    else:
        for varBindTableRow in varBindTable:
            for oid, val in varBindTableRow:
                 print varBindTableRow


Result:

Code: Select all
[(ObjectName('1.3.6.1.2.1.4.21.1.1.0.0.0.0'), IpAddress('0.0.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.10.9.0.0'), IpAddress('10.9.0.0'))]
[(ObjectName('1.3.6.1.2.1.4.21.1.1.192.168.1.0'),
IpAddress('192.168.1.0'))]


How can i get IpAddress values from this list and put they in the
dictionary? Or may be there is much better solution?



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