=============
NSM Responder
=============

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This chapter covers some aspects related to the :osdx:cfg:`service nsm responder` tool,
which allows NSM responders to be configured to answer received active traffic probes.

Depending on the protocol through which to receive and answer the probes, the ``type`` of
NSM responder must be configured using one of the following values:

* ``udp``: to receive and respond SLA UDP packets.
* ``twamp``: to receive and respond TWAMP-test packets (rfc5357).

It should be noted that in the case of ICMP probes there is no specific responder, since
the system's own ICMP mechanism can be used.

Finally, the ``port`` where the responder expects to receive probes must be configured.


Configuration
=============

This is the syntax to create a :osdx:cfg:`service nsm responder`:

.. code-block:: none

  set service nsm responder [ ... ]


Examples
========

SLA UDP responder
-----------------

Imagine you want to configure an NSM responder to receive SLA UDP packets in port 60000.

In OSDx, this can be achieved by setting the following command:

.. code-block:: none

  set service nsm responder type udp port 60000

:doc:`Here </examples/service/nsm/index>`, you can find more examples related to
``service nsm responder``.


Command Summary
===============

.. osdx:cmdtree:: cfg

  service nsm responder