Silvertip257, when you did this CentOS 6/KVM/bonding/bridging, did you ever get all the parts playing together correctlhy?
I'm facing a setup with only two NIC's, and need for multiple trunked VLAN access, and bonded pairs, and KVM based bridges to get the VM's with exposed IP addresses. I can get basically any 2 out of the 3 server network components working, binding, VLAN's, or KVM bridging, but attempts to pull all together on CentOS 6.3 fails. I'm finding numerous partial references, and a lot of speculation of "this setup should work!", but no cases of anyone actually doing it. And I'm unable to reach out to the upstream vendor directly until some paperwork gets straightened out.
(And oh, I've been away from CentOS for a while, but am in the midst of deploying about 50 CentOS VM's on KVM virtualization if I can *get this working!!!!*)