switchport protected is not actually private vlan, it prevents one port talking to another on the same switch only, once it reaches the other switch it will not be a valid config. The correct config for private VLAN can be seen on the link below.
If the interfaces will talk to other VLANs, you need to configure the SVI to understand it will serve the private VLANs.
interface vlan 100
private-vlan mapping 999
That's it, but notice that now interface f0/1 will not talk to f0/2 and to any other interface inside vlan 100, if you want a port to communicate to f0/1 or f0/2 this new port would need to be configured as a promiscuous one (In case it needs to talk to both of them) or create a community private-vlan and configure the ports desired on it. (F0/1 and F0/2 can't be on the same community VLAN or they'll be able to talk to each other).
If the intention is to prevent one specific port from talking to all the others, you can put only this interface in the private VLAN instead of both.
wrote too much, if this answers your question let me know, or we can create a practical scenario for it.
Thanks for your prompt respond. For this case, Client A and Client B is located on 2 different switch. eg Client A is located at 2960 A and Client B is located on 2960 B. Between for 2960, it unable to create private VLAN. Only switchport protected is allow, that why I can only configure private VLAN on 3750 trunk port which is connected to the 2 x 2960 switches.
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