Chassis Manager detects line card insert or remove events from Open Network Linux Platform (ONLP) and publishes these events along with the line card type and slot number information. The port default properties for the line card type is published in the line card specific configuration file.
Interface Manager updates the chassis configuration file when a line card insert or removal event is received and notifies Stratum of the port map change using GNMI. Stratum processes the difference in the new configuration and initializes the new ports.
Interface Manager is also responsible for updating the operDB with the new interface create events and pushing the configuration for these interfaces down to Stratum. Interface Manager monitors the state of the new interfaces and updates the state to operDB.