From: Bob Usa (boby2kusa@hotmail.com)
Date: Mon Feb 24 2003 - 22:09:48 GMT-3
The sum of all bandwidth allocation on an interface cannot exceed 75 percent
of the total available interface bandwidth. The remaining 25 percent is used
for other overhead, including Layer 2 overhead, routing traffic, and
best-effort traffic. Bandwidth for the CBWFQ class-default class, for
instance, is taken from the remaining 25 percent. However, under aggressive
circumstances in which you want to configure more than 75 percent of the
interface bandwidth to classes, you can override the 75 percent maximum sum
allocated to all classes or flows using the max-reserved-bandwidth command.
If you want to override the default 75 percent, exercise caution and ensure
that you allow enough remaining bandwidth to support best-effort and control
traffic, and Layer 2 overhead.
>From: Weihan Wu <weihanwu@yahoo.com>
>Reply-To: Weihan Wu <weihanwu@yahoo.com>
>To: weihanwu@yahoo.com, ccielab@groupstudy.com
>CC: discuss-it@lists.netmasterclass.net
>Subject: CBWFQ maximum bandwidth allocation
>Date: Sun, 23 Feb 2003 20:39:11 -0800 (PST)
>
>Hi All,
>
>I'm a bit unclear on the following quote from documentation CD. Does it
>mean
>that my 4 classes can only have bandwidth added up to link bandwidth (256k
>in
>this case), or should the 4 classes total to 75% of 256k? Or assume the
>25%
>will go to class-default?
>
>Thanks,
>
>Weihan
>
>(From CCO)
>"You can configure class policies for as many classes as are defined on the
>router, up to the maximum of 64. However, the total amount of bandwidth
>allocated for all classes included in a policy map must not exceed 75
>percent
>of the available bandwidth on the interface. The other 25 percent is used
>for
>control and routing traffic. (To override the 75 percent limitation, use
>the
>max-reserved bandwidth command.) If not all of the bandwidth is allocated,
>the
>remaining bandwidth is proportionally allocated among the classes, based on
>their configured bandwidth."
>
>class-map http
> match protocol http
>class-map icmp
> match protocol icmp
>class-map dns
> match protocol dns
>class-map telnet
> match protocol telnet
>!
>policy-map ccie
> class http
> bandwidth percent 20
> class icmp
> bandwidth percent 20
> class dns
> bandwidth percent 20
> class telnet
> bandwidth percent 40
> class class-default
> fair-queue
>!
>interface f0/0
> bandwidth 256
> service-policy output ccie
>
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