Can someone please help me to understand bandwidth reservation for CBWFQ.
By default you cannot allocate more than 75% of the interface bandwidth to your classes. My question is what is the point? theoretically it is reserved for your routing protocols etc.etc. but in reality if the interface is saturated isn't that extra 25% used by whatever traffic anyway? it not like you guarantee a maximum of 75%, you guarantee a minimum of 75% so the additional 25% is still up for grabs, it's just that it's not reserved for any class in particular.
hope the question makes sense.
When you use the bandwidth command under a class, that class no longer uses WFQ.
So, if you have 99% reserved bandwidth, this means that only 1% is going to use WFQ. This means that even with WFQ, the other traffic will 'interfere' or cause control traffic to be dropped. With WFQ, the lower values of 0-5 are still sent, but they just not as quickly.