From: Frank CCIE (frankccie@gmail.com)
Date: Mon Dec 10 2007 - 23:37:38 ART
Hi, Phillip,
Is the burst in Byte or bps? In your formula and Solution 1 and 2, Burst
is in bps in .125 ms.
DocCD shows the normal burst size in bytes. I am little confused.
Thanks
Frank
On Dec 10, 2007 2:46 PM, <Phillip.McCollum@ins.com> wrote:
> Dwayne,
>
> The minimum burst to sustain the policing rate is determined by the
> following formula:
>
> Burstmin (bits) = Rate (bps) / Interval (1/sec)
>
> Remember that the interval is fixed at .125 ms (8 intervals per second)
>
> 1.) Burstmin = 2000000 / 8 (intervals) = 250000 (bits per interval)
> 2.) Burstmin = 3000000 / 8 (intervals) = 375000 (bits per interval)
>
> For question 1, your choice would allow you to send 2Mpbs of data in
> only 2 intervals (250 ms), before policing would kick in... For question
> 2, your choice would allow you to send 3Mbps of data in 3 intervals (375
> ms), before policing would kick in.
>
> Hope this made some sense...
>
> HTH,
> Phillip
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Athaide, Dwayne
> Sent: Monday, December 10, 2007 11:13 AM
> To: Cisco certification
> Subject: QOS Aggregate
>
> Below are two scenario I ran into in my practice workbook. Please let
> me know if my solution is correct and any reason its not thanks
>
>
>
> Question states
>
> VLAN B should allow no more than 2mb total throughput. Would my
> solution still be correct? Where did they get the 250000 in Solution 1
> and 375000 in Solution 2?
>
>
>
> My solution
>
> mls qos aggregate-policer AGG 2000000 1000000 exceed-action drop
>
> !
>
> policy-map POLICE-AGG
>
> class class-default
>
> police aggregate AGG
>
>
>
> interface FastEthernet0/1
>
> switchport access vlan 12
>
> service-policy input POLICE-AGG
>
> !
>
> interface FastEthernet0/2
>
> switchport access vlan 12
>
> service-policy input POLICE-AGG
>
>
>
> Solution guide
>
> mls qos aggregate-policer VLANB 2000000 250000 exceed-action drop
>
> !
>
> class-map match-all B
>
> match vlan 12
>
> match class-map class-default
>
> !
>
> !
>
> policy-map MyQoS
>
> class B
>
> police aggregate VLANB
>
>
>
> interface FastEthernet0/1
>
> switchport access vlan 12
>
> service-policy input MYQOS!
>
> interface FastEthernet0/2
>
> switchport access vlan 12
>
> service-policy input MYQOS
>
>
>
>
>
> Question 2 : Vlan D should make sure that any speaker will not flood the
> LAN with more than 3MB of traffic at a time
>
>
>
> My solution
>
> mls qos aggregate-policer VLAND 3000000 1000000 exceed-action drop
>
> policy-map AGG
>
> class class-default
>
> police aggregate VLAND
>
>
>
> Service policy applied inbound on ports in the VLAN
>
>
>
> Solution guide
>
>
>
> policy-map VLAND
>
> class class-default
>
> police 3000000 375000 exceed-action drop
>
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