Walking operations¶
Bulk walk MIB¶
Send a series of SNMP GETBULK requests * with SNMPv2c, community ‘public’ * over IPv4/UDP * to an Agent at 195.218.195.228:161 * with values non-repeaters = 0, max-repetitions = 25 * for two OIDs in tuple form * stop on end-of-mib condition for both OIDs
This script performs similar to the following Net-SNMP command:
$ snmpbulkwalk -v2c -c public -C n0 -C r25 -ObentU 195.218.195.228 1.3.6.1.2.1.1 1.3.6.1.4.1.1
from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdgen
from pysnmp.carrier.asyncore.dgram import udp
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv2c setup
#
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Specify security settings per SecurityName (SNMPv1 - 0, SNMPv2c - 1)
config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 1)
#
# Setup transport endpoint and bind it with security settings yielding
# a target name
#
# UDP/IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpSocketTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('195.218.195.228', 161),
'my-creds'
)
# Error/response receiver
def cbFun(snmpEngine, sendRequesthandle, errorIndication,
errorStatus, errorIndex, varBindTable, cbCtx):
if errorIndication:
print(errorIndication)
return # stop on error
if errorStatus:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
)
)
return # stop on error
for varBindRow in varBindTable:
for oid, val in varBindRow:
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
return True # signal dispatcher to continue walking
# Prepare initial request to be sent
cmdgen.BulkCommandGenerator().sendVarBinds(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
0, 25, # non-repeaters, max-repetitions
[ ((1,3,6,1,2,1,1), None),
((1,3,6,1,4,1,1), None) ],
cbFun
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
Download
script.
Fetch two subtrees in parallel¶
Send a series of SNMP GETNEXT requests with the following options:
- with SNMPv1, community ‘public’
- over IPv4/UDP
- to an Agent at 195.218.195.228:161
- for two OIDs in tuple form
- stop on end-of-mib condition for both OIDs
This script performs similar to the following Net-SNMP command:
$ snmpwalk -v1 -c public -ObentU 195.218.195.228 1.3.6.1.2.1.1 1.3.6.1.4.1.1
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import cmdgen
# Create SNMP engine instance
snmpEngine = engine.SnmpEngine()
#
# SNMPv1/2c setup
#
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Specify security settings per SecurityName (SNMPv1 - 0, SNMPv2c - 1)
config.addTargetParams(snmpEngine, 'my-creds', 'my-area', 'noAuthNoPriv', 0)
#
# Setup transport endpoint and bind it with security settings yielding
# a target name
#
# UDP/IPv4
config.addTransport(
snmpEngine,
udp.domainName,
udp.UdpSocketTransport().openClientMode()
)
config.addTargetAddr(
snmpEngine, 'my-router',
udp.domainName, ('195.218.195.228', 161),
'my-creds'
)
# Error/response receiver
def cbFun(snmpEngine, sendRequestHandle, errorIndication,
errorStatus, errorIndex, varBindTable, cbCtx):
if errorIndication:
print(errorIndication)
return
# SNMPv1 response may contain noSuchName error *and* SNMPv2c exception,
# so we ignore noSuchName error here
if errorStatus and errorStatus != 2:
print('%s at %s' % (
errorStatus.prettyPrint(),
errorIndex and varBindTable[-1][int(errorIndex)-1][0] or '?'
)
)
return # stop on error
for varBindRow in varBindTable:
for oid, val in varBindRow:
print('%s = %s' % (oid.prettyPrint(), val.prettyPrint()))
return 1 # signal dispatcher to continue
# Prepare initial request to be sent
cmdgen.NextCommandGenerator().sendVarBinds(
snmpEngine,
'my-router',
None, '', # contextEngineId, contextName
[ ((1,3,6,1,2,1,1), None),
((1,3,6,1,4,1,1), None) ],
cbFun
)
# Run I/O dispatcher which would send pending queries and process responses
snmpEngine.transportDispatcher.runDispatcher()
Download
script.
See also: library reference.