What is mechanism for checking L2 reachability
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 receives no CFM frames from its configured broadcast domain.