nfd-asf-strategy
================

Synopsis
--------

**nfdc strategy set** **prefix** *NAME* **strategy**
/localhost/nfd/strategy/asf[/v=5][/**probing-interval**\ ~\ *INTERVAL*][/**max-timeouts**\ ~\ *TIMEOUTS*]

Description
-----------

**ASF** is an Adaptive Smoothed RTT-based Forwarding Strategy that chooses the
best next hop based on SRTT measurements, and also periodically probes other
next hops to learn their RTTs.

Options
-------

.. option:: probing-interval <INTERVAL>

    This optional parameter tells ASF how often to send a probe to determine
    alternative paths. The value is specified in milliseconds (non-negative
    integer). Smaller values will result in higher overhead but faster reaction.
    The default value is 1 minute and the minimum value is 1 second.

.. option:: measurements-lifetime <LIFETIME>

    This optional parameter tells ASF how long to retain NamespaceInfo and FaceInfo
    measurements if they are not actively updated. If not specified, this value defaults
    to 5 minutes. This value is specified in (non-negative integer) milliseconds and must
    be greater than the probing interval, as otherwise there is negligible benefit gained
    from the additional traffic generated by ASF.

.. option:: max-timeouts <TIMEOUTS>

    This optional parameter makes ASF switch to another appropriate face (if available)
    after it has encountered the specified number of timeouts. The value is a positive
    integer and defaults to 3, i.e., switch to another face after 3 timeouts. Smaller
    values make ASF more sensitive to timeouts and will switch paths more frequently,
    which should provide a faster reaction to link failures. Larger values may be better
    suited when transient timeouts are common and for certain application uses.

Examples
--------

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf``
    Use the default values for all parameters.

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf/v=5/probing-interval~30000``
    Set the probing interval to 30 seconds.

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf/v=5/max-timeouts~5``
    Set the maximum number of timeouts to 5.

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf/v=5/measurements-lifetime~120000``
    Set the maximum measurement lifetime to 2 minutes.

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf/v=5/probing-interval~30000/max-timeouts~2/measurements-lifetime~120000``
    Set the probing interval to 30 seconds, the maximum number of timeouts to 2, and the maximum measurement lifetime to 2 minutes.

``nfdc strategy set prefix /ndn strategy /localhost/nfd/strategy/asf/v=5/retx-suppression-multiplier~2.5/probing-interval~45000``
    Set the retransmission suppression multiplier to 2.5 and the probing interval
    to 45 seconds. See :manpage:`nfdc-strategy(1)` for more information on the
    retransmission suppression parameters.

See Also
--------

:manpage:`nfdc-strategy(1)`