On the test, I isolate the ports from each other, allowing traffic to go only to uplink (the port from which the Internet comes), I have it 25.
Let’s connect to the switch and see the current configuration:
Now go into the configuration mode:
Isolate the necessary ports, except the uplink port:
interface port-channel 1-24,26-28 vlan1q port-isolation exit exit
Save the configuration:
The ports on which the vlan1q port-isolation command is written do not see other ports with the same command, but see the ports without it and the switch CPU. Ports without the command vlan1q port-isolation see the ports with it and without it.