Ontriggerenter and InvokeRepeating problem

Hello, this is my code:

 // variable to ensure that InvokeRepeating only runs once.
 private var RespawnState : boolean = false;
 
 function OnTriggerEnter (other : Collider) {
 
     if (other.tag == "Player"){
 
     // continue if we are the server...
         if(Network.isServer) {
 
             if(RespawnState == false) {
 
                 RespawnState = true;
                 InvokeRepeating ("Spawn", 1, 20); // start Invoke
 
             }
 
         }
 
     }
 }

 function Spawn(){
 
     var instantiatedenemy = Network.Instantiate (...);
 
 }

InvokeRepeaing should only be executed if we are the server, however, if we are not the server (we are client) InvokeRepeating is also executed.

What i am doing wrong?

Thank you, and sorry for my english. :P