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If Class B needs additional b/w (bandwidth), and Class A is currently being used at a fraction of the 50%, do Cisco routers have the capability of configuring for automatic bandwidth adjustments so that Class B "temporarily" increases to a higher b/w percentage (using either resources for Class A or Class Default), and returns that b/w to the original class when Class B no longer needs it or the original class (higher priority) does need it?
Yes, with your defined policy Class B will "borrow" unused bandwidths from other classes.
Would the "fair-queue" command help with this? (see example)
No, although FQ offers the advantages of proportional bandwidth sharing between flows within the same class and avoid synchronized tail drop for all the flows within the same class.
