This feature is disabled by default. It can be enabled by a CLI toggle "logging transceiver communication" under the "monitor layer1" config mode. Note that “logging transceiver” will enable SMBus communication failure and digital optical monitoring syslogs.  See under Resources for more information on digital optical monitoring syslogs.

Common Management Interface Specification (CMIS) compliant transceivers are complex and can have many points of failure. Previously one had to look through transceiver agent logs to determine if a transceiver had any firmware, SMBus, or timeout errors.