# 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.pysnmp.com SNMPv2-MIB::sysDescr.0

    import asyncio
    from pysnmp.hlapi.v3arch.asyncio import *

    async def run():
        snmpEngine = SnmpEngine()

        iterator = get_cmd(
            snmpEngine,
            CommunityData("public", mpModel=0),
            await UdpTransportTarget.create(("demo.pysnmp.com", 161)),
            ContextData(),
            ObjectType(ObjectIdentity("SNMPv2-MIB", "sysDescr", 0)),
        )

        errorIndication, errorStatus, errorIndex, varBinds = await iterator

        if errorIndication:
            print(errorIndication)

        elif errorStatus:
            print(
                "{} at {}".format(
                    errorStatus.prettyPrint(),
                    errorIndex and varBinds[int(errorIndex) - 1][0] or "?",
                )
            )
        else:
            for varBind in varBinds:
                print(" = ".join([x.prettyPrint() for x in varBind]))

        snmpEngine.close_dispatcher()

    asyncio.run(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.pysnmp.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.pysnmp.com SNMPv2-MIB::system

    import asyncio
    from pysnmp.hlapi.v3arch.asyncio import *

    async def run(varBinds):
        snmpEngine = SnmpEngine()
        while True:
            errorIndication, errorStatus, errorIndex, varBindTable = await bulk_cmd(
                snmpEngine,
                UsmUserData("usr-none-none"),
                await UdpTransportTarget.create(("demo.pysnmp.com", 161)),
                ContextData(),
                0,
                50,
                *varBinds,
            )

            if errorIndication:
                print(errorIndication)
                break
            elif errorStatus:
                print(
                    f"{errorStatus.prettyPrint()} at {varBinds[int(errorIndex) - 1][0] if errorIndex else '?'}"
                )
            else:
                for varBind in varBindTable:
                    print(" = ".join([x.prettyPrint() for x in varBind]))

            varBinds = varBindTable
            if is_end_of_mib(varBinds):
                break
        return

    asyncio.run(
        run([ObjectType(ObjectIdentity("TCP-MIB")), ObjectType(ObjectIdentity("IP-MIB"))])
    )

`Download` script.

See also: library reference.

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