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What is mechanism for checking L2 reachability

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Applies to

ONTAP 9

Answer

  • In order to identify OSI layer 2 reachability issues, an L2 algorithm is used to ping the MAC addresses of the other ports in the cluster that belong to the same broadcast domain.
  • The L2 ping is performed by sending Connectivity Fault Management (CFM) frames
  • A port considers itself 'healthy' if it receives a CFM frame from any other port in its configured broadcast domain
  • A port considers itself 'degraded' if it is receives no CFM frames from its configured broadcast domain

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