My understanding is that if the ports are configured to fail closed they will fail closed if there is a link failure, or if the sensor fails.
What do you mean by "If the port is not operating is normally"?
If you have a link failure on a port that is configured to fail closed it should not affect the other ports on the device. (At least that's how it works with fail-open)
If you need a definitive answer I would suggest you contact support and ask them to clarify the fail closed action for any conditions for your specific sensor model and software version.
If possible I would also recommend testing these scenarios so you can confirm the results.
Consider this simple topology:
My question is, in what condition that Sensor will do a fail-closed:
- Sensor is failed(sure, it will fail-closed)
- The SW1's G0/0 interface is shutdown, so the Link between SW1 and NSP is down
- The 1A port on the Sensor got problem and not operate
And what's action that the Sensor take: Will it close all port on Sensor, or just 2 port on a pair interface?