[c-nsp] QoS Bandwidth percent vs bandwidth remaining percent

[Andriy Bilous]

Multilink. As members come and go you could still have your bandwidth
"slices" proportional to the actual bandwidth available at any given
time.

On Tue, Jul 13, 2010 at 7:56 PM, Kenny Sallee <kenny.sallee at gmail.com> wrote:
> So - I've research the difference between the 'bandwidth percent' and
> 'bandwidth remaining percent' commands with regards to configuring a
> policy-map on a Cisco router.  There are some good links to folks who have
> the theory behind each command:
>
> Cisco:
> http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml
> Other Web stuff:
> http://ardenpackeer.com/qos-voip/tutorial-what-is-the-difference-between-bandwidth-percent-and-bandwidth-remaining-percent/
>
>
> And a couple others.  What I gather as far as difference is that with
> 'bandwidth percent' you allocate % of bandwidth based on the entire real
> (physical interface) or configured (logical interface) bandwidth.  So the
> configured bandwidth %'s must all equal 100%.  With 'bandwidth remaining
> percent' you allocate your % for each class map based on what's left over
> after a class is configured with the 'priority <bw> or <%>' command.  So the
> 'priority' command could reserve 90% of an interface - then the remaining BW
> you can split that to equal 100% of the remaining bandwidth between all the
> other classes you have configured.  I also get that max-reserved-bandwidth
> can be manipulated to change what the real % you can allocate is...
>
> So from this - the one advantage I can see to 'bandwidth remaining percent'
> is that you can get more granular with how you allocate traffic to each
> class.  Outside of that - I'm not really sure / clear on the operational
> advantage of one over the other?  Any thoughts or opinions?
>
> Thanks,
> Kenny
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