.. _example_service_cfm_checkbridgeforwarding:

#######################
Check Bridge Forwarding
#######################

The CFM service can be activated on the ports of a bridge, allowing the bridge to make forwarding decisions
depending on the content of the datagrams received on the CFM port. The following scenarios show how, with
different configurations, the bridge does or does not forward CFM datagrams.

.. image:: topologybridge.svg
  :width: 800

**************************
Non CFM Bridge Forward CCM
**************************

Description
===========

In this scenario, the CFM service is not configured on any port of the bridge `br0` of DUT0.
So, the bridge should forward any CFM datagram received on its ports.

Scenario
========

.. include:: checkbridgeforwarding/noncfmbridgeforwardccm

.. raw:: html

  <hr>

**********************************
CFM Bridge Forward Above Level CCM
**********************************

Description
===========

In this scenario, the CFM service is configured on port `eth0` of the bridge `br0`
of DUT0. So, the bridge should forward the CFM datagrams received on said port, as long as they come
with a `level` field higher than the one configured in `eth0`.

Scenario
========

.. include:: checkbridgeforwarding/cfmbridgeforwardabovelevelccm

.. raw:: html

  <hr>

**************************************
CFM Bridge Not Forward Equal Level CCM
**************************************

Description
===========

In this scenario, the CFM service is configured on port `eth0` of the bridge `br0`
of DUT0. So the bridge should not forward CFM datagrams received on said port, when they come with
a `level` field equal to the one configured in `eth0`.

Scenario
========

.. include:: checkbridgeforwarding/cfmbridgenotforwardequallevelccm

.. raw:: html

  <hr>

**************************************
CFM Bridge Not Forward Below Level CCM
**************************************

Description
===========

In this scenario, the CFM service is configured on port `eth0` of the bridge `br0`
of DUT0. So the bridge should not forward CFM datagrams received on said port, when they come with
a `level` field lower than the one configured in `eth0`.

Scenario
========

.. include:: checkbridgeforwarding/cfmbridgenotforwardbelowlevelccm

.. raw:: html

  <hr>