Thanx for reply,

yeah this is right, By default this is enable on cisco Swiches 3750.

I want to make one switch as a Root Switch and others as client.

so does i need to configure only my Root Switch for STP or i will enable on all switches.

By default STP will choose one switch as root bridge.

Any switch you want elected as root bridge for all vlan do the below configuration on it

sw 1 (config) #spanning-tree vlan (vlans id e.x:1,3-5) root primary

if you if this switch go down and you don’t want STP calculate and choose any switch

you can go to second switch and use :

sw 1 (config) #spanning-tree vlan (vlans id e.x:1,3-5) root secondary

It mean i need just  configure only root Switch and did disable STP on other switches ?

No ,

STP :

why using STP : to prevent L2 loop

How : by find one single path between two switches.

,,,,,,,,,,,,,,,,,,,,,

in STP domain must one switch come root bridge.

so you don’t need disable in other switches

My recommendation keep the STP as is . And read about STP protocol

I Agree with that. It is known that STP start making issues once the ring goes beyond 6 or 7 switches.

If your Vlans are all local to one switch (ex. sw 1 has vlan 20,30. sw 2 has vlan 40,50). then i would recommend to change the connecting links to routed ports and just do proper routing between. the routing protocols will take care of loops/convergence in case of link failures.

All the core(3750) switch are connected on trunk and Distribution(3500/2950) switch are also connected on trunk with core switch(3750), then on Distribution switch  (3500/2950) srw/Netgare are connected through VLAN

drawing could be nice. didnt understand the topology.