The customer’s use case is set in a audio/video streaming environment. In order to maintain the quality of streams they need to synchronize time via the PTP protocol. They are using a PTP grandmaster clock appliance and the time is synchronizied across their network. They want to assure, that on a switch the time is learned on a specific port.

In PTP terminology a port participating in the clock synchronzation process is called a clockPort and each of these ports have a so called clockState indicating whick role these ports have related to their directly connected neighbors. To assure that the time is synchronized by using a specific neighbor the port connecting this neighbor need to be in slave mode, which means the neighbor is master. The port states are defined as follows:

Our idea for a poller is that we use our pattern scheme, like PTP-<clockPort>-<clockState> to bind a service to switch node. The poller will then check whether the given port is in the desired state and will go down if it is not.