spanning tree - balanced without use vlan ?

[martin.germano]

Hi, i´m sorry if this is a classic question.

 i have implemented rapid pvst like show in the image. The dotted lines are the alternative links. (image 1)

SwitchA# spanning-tree vlan 1 root primary
SwitchB# spanning-tree vlan 1 root secondary

I want to make a kind of balancing like image 2. But the problem is that i have vlan 100 (and other vlans) in side A and Side B.

  So, if i make 

SwitchB: spanning-tree vlan 100 root primary
SwitchA: spanning-tree vlan 100 root secondary

  The SwB it change to primary for vlan 100. 

  But i want to the switchB be the primary for side A and secondary for side A. No matter the vlan. Is possible?

Thanks a lot!

IMAGE 1

IMAGE 2

PS: Later i will implement HSRP.

[vishal vyas]

Please use odd and even numbering for vlan assignment

Site A - all odd number vlans

Site B - all even number vlans 

[martin.germano]

  Hi, i know that is possible, but doing this the result is unbalanced for mi network. For example vlan 20 reside in all switches and vlan 21 reside in only one switch. 

  i want to the switchA be the primary for side A and secondary for side B. No matter the vlan. Like image 2.

  I hope to be clear.

Thanks.