From: McClure, Allen (Allen.McClure@Yum.com)
Date: Fri Oct 10 2003 - 15:47:05 GMT-3
Ahh I get ya. Some providers change the max reserved bandwidth to 100%
for their commerical MPLS services and such. My understanding is that
the extra 25% is left over for the default-class, which contains things
that might not be considered in your classes (routing protocols, misc
protocols, etc..). Obviously if you expect minimal default traffic and
really think you've classified it all, you could bump to 100% and
reserve it all. I would be very histitant to "choke" the default class.
Again, my understanding is that unreservable 25% is utilized by the
default-class. I'll research to confirm... Again. Gah I hate
forgetting stuff.
Allen G. McClure
CCNP/CCDP/MCSE
Yum! Brands, Inc.
Sr. Network Analyst
allen.mcclure@yum.com
-----Original Message-----
From: Chris Larson [mailto:clarson52@comcast.net]
Sent: Friday, October 10, 2003 1:38 PM
To: McClure, Allen
Cc: ccielab@groupstudy.com
Subject: Re: Class Default
Here is my thinking:
If the max reserved bandwidth is 75% and the remainder is for anything
not defined in your class maps then all is good.
However, if you define a default class map that anything not matching
your other classes goes into (ie. everything else) then what is the
purpose of the 25% of bandwidth that was reserved? It is wasted...all
other traffic is going to your defined default class. So what is that
leftover 25% going to be used for then?
If they said ftp 25%, html 25%, smtp 40% and everything else 10%
bandwidth then I think you would create a class default and change the
max-reserved bandwidth to zero. If you didn't all the "other" traffic
goes to your default class and the 25% bandwidth you left reserved goes
totally unused and is basically wasted. The flip side might be that you
define the specific classes excpet for a default class and change
max-reserved to 10%.
See what I am getting at.
----- Original Message -----
From: "McClure, Allen" <Allen.McClure@Yum.com>
To: "Chris Larson" <clarson52@comcast.net>; <ccielab@groupstudy.com>
Sent: Friday, October 10, 2003 1:48 PM
Subject: RE: Class Default
> You shouldn't really mess with max-reserved unless you are required to
> IMO.
>
> I think that it's important to realize that the default-class is
> generally used as a "best-effort" dumping ground. With that being the
> case, you certainly want the classes that you took the time and effort
> to define to be allocated bandwidth, policed, or whatever, assuming
> that is the goal. Otherwise, what would be the point in defining
> non-default classes in the first place?
>
> I could be missing the point, let
me know.
>
> Allen G. McClure
> CCNP/CCDP/MCSE
> Yum! Brands, Inc.
> Sr. Network Analyst
> allen.mcclure@yum.com
>
> -----Original Message-----
> From: Chris Larson [mailto:clarson52@comcast.net]
> Sent: Friday, October 10, 2003 12:39 PM
> To: ccielab@groupstudy.com
> Subject: Class Default
>
>
> If we are asked to configure multiple classes for CBWFQ and a class
> for all other traffic ( a default) then wouldn't it be the case that
> we should make max reserved bandwidth 0
>
> Any traffic that does not confirm to the defined classes would go into
> the configure default class and therefore I think you would not want
> to keep any reserved bandwidth on the interface.
>
> It would all go towards the policy that has the configured default
> class?
>
> Is that correct?
>
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