From: Jim (nhatquang@thiennam.org)
Date: Fri May 06 2005 - 00:51:07 GMT-3
task wording makes a little difference in the config but in some cases big
trouble comes if we are not get accustomed with kind of expressions.
what I see in this task is a requirement limiting ICMP traffic to 16Kbs to
prevent DoS acttacks. So what is the difference in usage of policing
ICMP with priority ( make a seperate class for its traffic) and leaving it
less priority to default-class? On the second case ( as in solution guide),
all other kind of traffics are served first and when it's done, it is turn
of ICMP. I think it is the meaning of "preventing DoS acttack". However, if
the task says "ICMP traffic is guaranted to 16Kbps" I will put it on a
seperate class of traffic ( like the way you do).
Any ideas?
Jim.
----- Original Message -----
From: "John Matus" <john_matus@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Friday, May 06, 2005 10:07 AM
Subject: IE LAB 18 qos question
> ok....for those of you w/ solution guides....
> the solution guide takes the qos requirements for icmp and nests them in a
> service-policy under the class-default. is there really a difference
> between creating 2 classes and defining the traffic engineering under each
> as opposed to having 1 class default and nesting service policies inside
> them?? i don't quite understand - but hey, this isn't the 1st time i
> have't understood :)
>
>
>
> class-map match-all voip
> match access-group 101
> class-map match-all icmp
> match protocol icmp
> class-map match-all bb2
> !
> !
> policy-map voip
> class voip
> priority percent 50
> policy-map bb2
> class voip
> set dscp ef
> class icmp
> police cir 16000
> class class-default
> police cir 2500000
> set dscp ef
> policy-map bb3
> class icmp
> police cir 16000
> class class-default
> police cir 3000000
> set dscp ef
>
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