*: The interface was suspended by the system

[ZawMinHtut06667]

Hello I am facing issue in one of the cisco 300G series POE swith interface. 

It showing < *: The interface was suspended by the system> and it block the interface.

I know how to recover it by typing set int active faxx

But I want to know why it is happened and how to avoid in future.

[balaji.bandi]

You need to investigate why this happend, could be loop, misconfiguration, or something else. by only screen shot not going to help here to assists better.

Reactivate Suspended Port—Select to reactivate a port that has been
suspended. There are numerous ways that a port can be suspended, such
as through the locked port security option, dot1x single host violation,
loopback detection, STP loopback guard or Access Control List (ACL)
configurations. The reactivate operation brings the port up without regard to
why the port was suspended.

refer admin guide :

https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf