Thanks for your replay....
simply i need to configure RB250GS as simply uplink port :-
1. port 1 connected to all ports
2. all traffic among ports must be disabled.
in other world all ports connected to port 1 and there must be isolation between other ports
simple this can be done be bridge and filter rules to disable all traffic but this will depends on CPU and software speeds
I am asking about the ability of switch all ports to port 1 but disable the other traffic between ports or isolation ports
is that possible with RB250GS ...hope my question is more clear now