By the way, there was a question about NIST Switch performance. This will vary with the speed of the machine and the network card, and the quality of the network card's device driver. Kind of humbling, but any attempts at optimization we do in the higher-level code mostly amount to noise level, except in some extreme cases, like with huge routing tables. Given a fast enough processor, the limiting factor is going to be PCI bus speed - with copy in and out, you're never going to get a sustained throughput more than half the PCI bus speed. This is obviously not a thorough test, but should give you an idea of the order of magnitude.
Labels are a new networking construct with as yet no firmly fixed associations.
Taking best advantage of this potential can be quite complex, requiring some period of experimentation and development.