hi i want configure private-vlan on cisco cat 3560 switch but when i put (switchport mode private-vlan host) on the community interface automatically the port goes down ( physical up but protocol down ), please help me how can i fix this problem .

Dears, i have a Cisco router C3900 and connected to a switch , i configured load balancing per destination ip and mac but one port has congestion and other ports too free why load balancing is not working properly ? why not balancing between ports ?