# Various SNMP versions

## SNMPv1

Send SNMP GET request using the following options:

> - with SNMPv1, community ‘public’

> - over IPv4/UDP

> - to an Agent at demo.snmplabs.com:161

> - for an instance of SNMPv2-MIB::sysDescr.0 MIB object

> - Based on asyncio I/O framework

Functionally similar to:

$ snmpget -v1 -c public demo.snmplabs.com SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.asyncio import *

    @asyncio.coroutine
    def run():
        snmpEngine = SnmpEngine()
        errorIndication, errorStatus, errorIndex, varBinds = yield from getCmd(
            snmpEngine,
            CommunityData('public', mpModel=0),
            UdpTransportTarget(('demo.snmplabs.com', 161)),
            ContextData(),
            ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0))
        )

        if errorIndication:
            print(errorIndication)
        elif errorStatus:
            print('%s at %s' % (
                errorStatus.prettyPrint(),
                errorIndex and varBinds[int(errorIndex) - 1][0] or '?'
            )
                  )
        else:
            for varBind in varBinds:
                print(' = '.join([x.prettyPrint() for x in varBind]))

        snmpEngine.transportDispatcher.closeDispatcher()

    asyncio.get_event_loop().run_until_complete(run())

`Download` script.

## Bulk walk MIB

Send a series of SNMP GETBULK requests using the following options:

- with SNMPv3, user ‘usr-none-none’, no authentication, no privacy

- over IPv4/UDP

- to an Agent at demo.snmplabs.com:161

- for all OIDs past SNMPv2-MIB::system

- run till end-of-mib condition is reported by Agent

- based on asyncio I/O framework

Functionally similar to:

$ snmpbulkwalk -v3 -lnoAuthNoPriv -u usr-none-none -Cn0 -Cr50
demo.snmplabs.com SNMPv2-MIB::system

    import asyncio
    from pysnmp.hlapi.asyncio import *

    @asyncio.coroutine
    def run(varBinds):
        snmpEngine = SnmpEngine()
        while True:
            (errorIndication,
             errorStatus,
             errorIndex,
             varBindTable) = yield from bulkCmd(
                snmpEngine,
                UsmUserData('usr-none-none'),
                UdpTransportTarget(('demo.snmplabs.com', 161)),
                ContextData(),
                0, 50,
                *varBinds)

            if errorIndication:
                print(errorIndication)
                break
            elif errorStatus:
                print('%s at %s' % (
                    errorStatus.prettyPrint(),
                    errorIndex and varBinds[int(errorIndex) - 1][0] or '?'
                )
                      )
            else:
                for varBindRow in varBindTable:
                    for varBind in varBindRow:
                        print(' = '.join([x.prettyPrint() for x in varBind]))

            varBinds = varBindTable[-1]
            if isEndOfMib(varBinds):
                break

        snmpEngine.transportDispatcher.closeDispatcher()

    loop = asyncio.get_event_loop()
    loop.run_until_complete(
        run([ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr'))])
    )

`Download` script.

See also: library reference.