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Example scripts
===============
.. toctree::
:maxdepth: 2
SNMP is not simple (PySNMP implementation takes over 15K lines of
Python code), but PySNMP tries to hide the complexities and let you
carry out typical SNMP operations in a quick and intuitive way.
PySNMP offers three groups of programming interfaces to deal with
SNMP protocol. In the order from most concise to most detailed those
APIs follow.
High-level SNMP
---------------
The so called high-level API (hlapi) is designed to be simple, concise and
suitable for the most frequent operations. For that matter only
Command Generator and Notification Originator Applications are currently
wrapped into a nearly one-line Python expression.
It comes in several flavours: one synchronous and a bunch of bindings to
popular asynchronous I/O frameworks. Those varieties of APIs bring
subtile differences, mostly to better match particular I/O framework
customs. Unless you have a very specific task, the high-level API might
solve your SNMP needs.
.. toctree::
:maxdepth: 2
/examples/hlapi/asyncore/sync/contents
.. toctree::
:maxdepth: 2
/examples/hlapi/asyncore/contents
.. toctree::
:maxdepth: 2
/examples/hlapi/asyncio/contents
.. toctree::
:maxdepth: 2
/examples/hlapi/trollius/contents
.. toctree::
:maxdepth: 2
/examples/hlapi/twisted/contents
Native SNMP API
---------------
Complete implementation of all official Standard SNMP Applications. It
should let you implement any SNMP operation defined in the standard
at the cost of working at a somewhat low level.
This API also comes in several transport varieties depending on I/O
framework being used.
.. toctree::
:maxdepth: 2
/examples/v3arch/asyncore/contents
/examples/v3arch/asyncio/contents
/examples/v3arch/trollius/contents
/examples/v3arch/twisted/contents
Packet-level SNMP
-----------------
In cases where performance is your top priority and you only need to
work with SNMP v1 and v2c systems and you do not mind writing much
more code, then there is a low-level API to SNMP v1/v2c PDU and
PySNMP I/O engine. There's practically no SNMP engine or SMI
infrastructure involved in the operations of these almost wire-level
interfaces. Although MIB services can still be used separately.
A packet-level API-based application typically manages both SNMP
message building/parsing and network communication via one or more
transports. It's fully up to the application to handle failures on
message and transport levels.
Command Generator
+++++++++++++++++
.. toctree::
/examples/v1arch/asyncore/manager/cmdgen/fetching-variables
/examples/v1arch/asyncore/manager/cmdgen/modifying-variables
/examples/v1arch/asyncore/manager/cmdgen/walking-operations
/examples/v1arch/asyncore/manager/cmdgen/transport-tweaks
Command Responder
+++++++++++++++++
.. toctree::
/examples/v1arch/asyncore/agent/cmdrsp/agent-side-mib-implementations
Notification Originator
+++++++++++++++++++++++
.. toctree::
/examples/v1arch/asyncore/agent/ntforg/transport-tweaks
Notification Receiver
+++++++++++++++++++++
.. toctree::
/examples/v1arch/asyncore/manager/ntfrcv/transport-tweaks
Low-level MIB access
--------------------
.. toctree::
/examples/smi/manager/browsing-mib-tree
/examples/smi/agent/implementing-mib-objects
Using these examples
--------------------
Before doing cut&paste of the code below into your Python interpreter,
make sure to install pysnmp and its dependencies by running pip or
easy_install: ::
# pip pysnmp
There's a public, multilingual SNMP Command Responder and Notification
Receiver configured at
`demo.snmplabs.com <http://snmplabs.com/snmpsim/public-snmp-simulator.html>`_ to let you run PySNMP examples scripts in a cut&paste fashion. If you
wish to use your own SNMP Agent with these scripts, make sure to either
configure your local snmpd and/or snmptrapd or use a valid address and
SNMP credentials of your SNMP Agent in the examples to let them work.
Should you want to use a MIB to make SNMP operations more human-friendly,
you are welcome to search for it and possibly download one from our
`public MIB repository <http://mibs.snmplabs.com/asn1/>`_. Alternatively,
you can configure PySNMP to fetch and cache required MIBs from there
automatically.
If you find your PySNMP application behaving unexpectedly, try to enable
a /more or less verbose/ built-in PySNMP debugging by adding the
following snippet of code at the beginning of your application:
.. code-block:: python
from pysnmp import debug
# use specific flags or 'all' for full debugging
debug.setLogger(debug.Debug('dsp', 'msgproc', 'secmod'))
Then run your app and watch stderr. The Debug initializer enables debugging
for a particular PySNMP subsystem, 'all' enables full debugging. More
specific flags are:
* io
* dsp
* msgproc
* secmod
* mibbuild
* mibview
* mibinstrum
* acl
* proxy
* app
For more details on PySNMP programming model and interfaces, please
refer to :doc:`library documentation</docs/api-reference>`.
|
