Hi,
Per-packet load balancing has drawbacks. Have a look at the url:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/switch_c/xcprt2/xcdcefc.htm#33184
In more traditional routers, before cef, it can be enabled by disabling fast switching on the interface with "no ip route-cache". This will start process switching on the interface which looks up every packet and load-balances them, cpu-intensive:
http://www.cisco.com/warp/public/105/46.html
The newer ones, with cef-enabled, can be configured with "ip load-sharing per-packet" in interface config mode.
The command option "ip load-sharing per-packet" is not available for C3750 from the command reference:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225sea/3750cr/cli1.htm
