A user level matches a certain command level. After logging in to a switch, a user can run only the commands of which the levels are the same as or lower than the user level. For example, a user at level 2 can run only the commands at levels 0, 1, and 2.
By default, the command level ranges from 0 to 3, and the user level ranges from 0 to 15. An administrator can change the command level as required so that users of different levels can execute commands correspondingly.
The administrator at user level 15 can run the following command to increase command levels:
Run the command-privilege level level view view-name command-key command with the command-key parameter specified.
Run the command-privilege level rearrange command to increase command levels in batches.
If the levels of commands have not been changed using the command-privilege level level view view-name command-key command, the levels of all level-2 and level-3 commands will be increased to level 10 and level 15 after the preceding command is executed, whereas the levels of level-0 and level-1 commands are unchanged.

You can find OSN 7500 on Thunder-link.com.