I know this has been covered in multiple community threads, as well as YouTube videos, etc. In fact, if anybody has a very good, basic reference for this concept, please share.
What is not clearly defined is the concept of bandwidth remaining versus bandwidth, and how it affects the default class.
I understand overall available bandwidth varies by method of allocation, but I'm primarily interested in the logical differences between "bandwidth percent" and "bandwidth remaining percent".
In this basic example
policy-map child
class 1
priority level 1
police rate percent 50
exceed action drop
class 2
bandwidth remaining percent 50
or
class 2
bandwidth percent 50
class class-default
end policy-map
Class 1 can use up to 50% of the bandwidth, and any excess packets are dropped.
If Class 2 is "bandwidth remaining percent" it actually only gets 25% of the overall bandwidth. In this case, there would be 25% for class default.
If Class 2 is "bandwidth percent" it gets up to the other 50% available. In this case there is 0% for class default in a congested situation.
What is correct and incorrect about my statements?
The "bandwidth percent" seems to provide more definition. I want 50% for priority traffic, and then I can allocate the other 50% among the other classes. However, I've read that the total can be greater than 100%, which does not make logical sense to me. Then I could have five classes each allocated 50%, which results in each actually getting 20%.
"Bandwidth remaining percent" seems infinite. I could continue every class as remaining percent 50, and it just keeps taking half of the remaining bandwidth. Then, it also then appears to require the sum of the values to equal 100, which doesn't line up with "remaining percent". Does that mean that, even though we're saying "remaining percent" it's actually an explicit percent of the overall bandwidth, rather than a percent of the remaining bandwidth?
