This CucsFabricTrafficDirection field specifies the traffic direction (such as receive, transmit, or both) that the source endpoint whose traffic is being mirrored by an FC SPAN monitoring session is configured to mirror. An admin sets or reads monTrafDir to confirm the SPAN session is capturing the direction of traffic actually needed for the analysis being performed. For example, if only transmit traffic is being captured but the investigation needs to see incoming frames too, the admin would check this field and reconfigure the monitored direction.