From: Marvin Greenlee (marvingreenlee@yahoo.com)
Date: Thu Oct 05 2006 - 20:57:25 ART
Think of max-reserved as a "safety threshold". It is
there primarily to prevent a misconfigured policy from
using up all the available bandwidth, such that
control traffic, etc., would not be able to get
through. All it does is prevent the application of a
policy that is asking for more than 75% of the
interface's bandwidth.
[Note: some of the earlier 12.1T/12.2 codes
calculated policies based on the max-reserved, so be
careful if you are using one of those codes. In
affected IOS versions, if you had a max reserved of
80% and specified a bandwidth percent of 50%, it would
allocate 40% (50% of 80%) for that class.]
Verify on your router with show policy interface x/x
For the purposes of the lab, if the question does not
give explicit values for the interface bandwidth, I
would assume that you are expected to use the default
for the interface.
Like everything else, if a section is unclear, ask the
proctor for clarification.
A doesn't do anything as far as restricting traffic.
B and C would act the same as each other, since
neither policy is asking for more than the
max-reserved.
Is there a reason why you have 65% in A and 75% in B
and C?
Thanks,
Marvin
--- "Alex De Gruiter (AU)"
<Alex.deGruiter@didata.com.au> wrote:
> Guys,
>
> I have a question about how Cisco considers the
> maximum bandwidth
> available on a line in terms of the CCIE lab.
>
> Lets say you have a router connected to a frame
> relay cloud, and the
> question states that you should never exceed 65% of
> the available
> bandwidth on the line. Assume that FRTS can not be
> used, and that you do
> not know the speed of the line.
>
> Which of the following solutions would be the most
> appropriate:
>
> A)
>
> int serial 0/0
> max-reserved-bandwidth 65
>
> B)
>
> policy-map POLICE
> class class-default
> police percent 75
>
> int serial 0/0
> max-reserved-bandwidth 100
> service-policy output POLICE
>
> C)
>
> policy-map POLICE
> class class-default
> police percent 75
>
> int serial 0/0
> ! Default bandwidth
> max-reserved-bandwidth 75
> service-policy output POLICE
>
> What do you think?
>
> Alex
>
>
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