From: Chan Hong (chan_hong33@yahoo.com)
Date: Mon Jan 07 2008 - 01:13:23 ARST
Dear Mark,
I think it should not use "bandwidth" in PREC2 because "bandwidth"
only take action when congestion occur. Before congestion, the traffic with
prec value 2 maybe above or below the 128K. It doesn't meet the requirement.
I
think shape average should be work(without mention the bc)
I'm not sure what
action will shape peak do............
Regards,
Howard
----- 6l%s-l%s ----
1H%s$H!R darth router <darklordrouter@gmail.com>
&,%s$H Mark Turner
<markturner101@gmail.com>
0F%;(CC) ccielab@groupstudy.com
6G0e$i4A!R 2008 &~
1$k 7 $i ,P4A$@ $W$H 10:44:10
%DCD!G Re: QOS Conundrum - bandwidth, shape
average or shape peak?
Under class PREC2
why not just do bandwidth 128, I
don't see anywhere in the question where it
indicates you need to shape. The
bandwidth statement is also a form a
policing, so you'd have to clarify with
the proctor, whether he meant not to
use ratelimit/police or ot not use the
commands "rate limit" or "police"
Also, shape peak 128000 really sends 256000
per interval, so you definitely
don't want that to happen.
DR
On 1/6/08,
Mark Turner <markturner101@gmail.com> wrote:
>
> Hello,
>
> I am trying to
solve the below question. I have included the
> configuration that I believe
will work. I am just unclear as to the
> best method to rate limit to a
specific value if rate limiting and
> policing are specifically forbidden. I
have narrowed it down to the
> shape average, shape peak or bandwidth
statement but cant decide which
> to use.
>
> "Configure R2 so that traffic
marked with the precedence value 3
> AND/OR traffic from VLAN_C (1.1.1.1) to
VLAN_BB2 (2.2.2.2) is
> guaranteed minimum of 128K of bandwidth when sent out
of interface
> fast 0/0. If congestion occurs assure this traffic is randomly
> dropped. Also make sure that traffic marked with prec value 2 is rate
>
limited to 128K. Do not use rate-limiting or policing."
>
> Access-list 100
permit ip 1.1.1.0 0.0.0.255 2.2.2.0 0.0.0.255
>
> class-map match-any prec3
>
match ip precedence 3
> match access-group name prec3
> !
> class-map
match-any PREC2
> match ip precedence 2
> !
> policy-map cisco
> class
VLANC-TO-VLAN_BB2
> bandwidth 128
> random-detect
> class PREC2
>
shape average 128000 -> my best guess
>
> OR
> class PREC2
> shape peak
128000
>
> OR
> class PREC2
> bandwidth 128
>
>
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