The bandwidth guarantees at least that much bandwidth to the class. That is why it will not allow you to allocate a total of more than the available bandwidth of the link. But if there ar any leftovers, then the class also gets a share of them.
The shape average limits the average traffic to under the figure. If it has more than that amount of traffic to transmit, then it will buffer it up into a hold buffer. You use that typically when you know that the remote end has a limited bandwidth and you want to be sure not to lose any of the traffic to it.
LLQ not only guarantees at least that amount of bandwidth, but also that the traffic in that class should have absolute priority on the link up to the specified bandwidth. Beyond that limit, if there is any spare capacity then the class gets a fair share of the leftovers as well, but not priority.
Hope this helps.
Kevin Dorrell
Luxembourg
