Cisco – Can you stack Cisco 3750 using ethernet cables

I attempted to stack the switches referencing the guides provided, but the commands were invalid, seemingly not applying to this device. I upgraded to the latest firmware to be sure it wasn't from having an old version. No luck.

I contacted HP support which told me this:

The stacking on this switch is different than the other procurve switches. There needs to be a stacking module attached to the switch to enable stacking.

So it appears that a stacking module is required to stack the 2920. Thanks for all the help. I'm going to buy stack modules now. I'm not sure how this will interact with other procurve switches in a stack. I wish the guides were more clear about all this up-front but maybe this posting will help others.

The other option is to use the second physical interface as a second subnet and let eigrp from a second neighbor relationship. If the speeds are the same you can do equal cost load balancing. Finally 2 separate L3 links are easier to troubleshoot than a port channel and you don't have to have the exact same hardware. Its a matter of style. I am assuming you are running eigrp between the switch and the router. If you are not then 2 static default routes will do the routing trick.