I continue to tell that there are simpler and more robust solutions to the same problems. And that it is much easier is not to create problems in the first place than to think up clever patches later.
Well, having built a couple of networks now, I've seen that in spite of the best efforts of people to anticipate traffic and get bandwidth installed before it is needed, things such as the real world and politics intervene and you can end up in situations where you just don't have enough bandwidth. Sometimes, if you are lucky, you are only out of bandwidth along the shortest path but you have some bandwidth along some other path. Then you either don't use it (and have piles of people peaved) or you try turning any knob you can to move some of the traffic along some other path. A much better solution is to install more bandwidth, but when you can't get it when you need it, you use other methods - such as traffic engineering. --asp@partan.com (Andrew Partan)