Martin Casado and his team have published a great series of blog articles describing hypervisor switching (for the VMware-focused details, check out my VMware Networking Deep Dive). It starts with an overview of Open vSwitch (the open source alternative for VMware’s vSwitch, commonly used in Xen/KVM environments), describes the basics of hypervisor-based switching and addresses some of the performance myths. There’s also an interesting response from Intel setting straight the SR-IOV facts.
After reading all those articles, you should start wondering:
- Why the heck would I need Cisco’s VN-Link (remember: it’s not the same as VN-Tag)?
- What is EVB bringing to the table? (hint: you might find the answer here)
As a side effect, you might also agree with me that VEPA is truly totally broken.