Hi Amit,
Are you using Cisco 3750 Switch at CORE layer also?
If yes I propose to use stacking between two switch.
With cascaded switches, each device is configured independently. With stacked switches, one is in charge of the stack and that's the one where all configurations are performed. So if you take two 48-port switches and stack them, you'll appear to have one giant 96-port switch when it comes to the configuration.
When we look at stacking, like I said, the difference is that this connection is part of the backplane instead of the spanning tree. So you're supercharging your switch setup and making it appear as a larger switch with more ports, but all under a single administrative control.
This is by far the simpler method of doing things, because configuration is centralized, and your biggest problem may be figuring out which switch is the controlling device! The upside is that it's easy and you don't lose ports to connect things together. The downside is that if one of the switches in the middle of your stack fails, what happens? Different switches and vendors actually treat this differently.
With Cisco StackWise (3750), if the master switch fails, another will simply take over. If by chance you get a split in your stack from failures, then you'll simply end up with two mini-stacks with two devices in charge. It's all part of Cisco's high-availability programs moving out to the wiring closet.
You do not need to bother about spanning-tree between two stackble switches.
When you connected single non stackble access swtich with the stack than you can use etherchannel and eliminate the use of spanning-tree.
Hope this will help to take decesion.
Rate of it will be helpful.
Regards,
