I use L2TP Server binding to link a username to an interface so that I can add the interface as part of a VRF and apply routes to it.
Normally when the client connects and authenticates, it is attached to the L2TP Server Binding interface successfully and life is good. Sometimes the remote clients router is rebooted and re-connects before the L2TP interface has timed out, and automatically creates a Dynamic interface since there is already an active Server Binding interface. The L2TP profile is set to only allow 1 active client, but I am not sure why Mikrotik is not stopping the dynamic interface from being created and only reconnecting once the original L2TP Service Binding interface times out. This creates an issue where the new dynamic interface is not part of the VRF and therefore the connection may seem up, but there is no routing for it.
So... How does one stop the router from adding a dynamic l2tp interface and only accept the connections using the l2tp server binding interface when it is linked to a client.