what is Right-to-Use (RTU) License?

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"I am a technology practitioner who has just entered the data communication industry. I have always hoped to increase the port speed through my efforts and achieve a smoother and stable network connection, whether it is for enterprises, operators or homes. Maybe your distance from the optimized network is just a license!
Recently I saw a very surprising technical guide, which introduced in detail the important concepts of switch licenses, and provided instructions for the use of a variety of service licenses and typical operating methods. I don't want to be the last person to know it!
This is the link:
https://support.huawei.com/enterprise/en/doc/EDOC1100195306"