"My first question is, if it's recommanded to activate spanning tree on all the port of a switch."
Sure you should. What you must to do is enable port-fast in access ports.
"If i'm not wrong, some vendors like HP has loopback detection witch can be apply directly to prevent loop on the switch. So you can mix loopback for edge port and STP for ports link to another switch."
Unfortunatelly Vendors has different approaches. But, loopback means Layer 3 protocol which in fact does not rely on STP. If you study about cisco SDA, you are going to see that Cisco switch on this solution, even access switch, speaks routing protocol (IS-IS) and all layer 2 communition is carried over Layer 3 communication.
"Is there a similary fonction on Cisco switch ?"
Probably not.
"My other question is, should i activate STP on all the ports off the switch ? The BPDU sent with spanning tree can cause a high usage of the switch ?"
Enable port-fast for access.
"Is the best practice on spanning tree : Activate STP on all ports, activate portfast on the différent port connecting to endpoint (for prevent problem with DHCP) ?""
that´s the idea.
