From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu Apr 15 2004 - 17:20:12 GMT-3
It's actually in bytes per interval. By setting the Bc you are
setting the interval length.
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Yasser Abdullah
> Sent: Thursday, April 15, 2004 9:53 AM
> To: 'Richard Dumoulin'; 'Karim'; ccielab@groupstudy.com
> Subject: RE: Police/ rate-limit parameters concept confusion
>
> Its in Bytes/sec.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Richard Dumoulin
> Sent: Thursday, April 15, 2004 5:23 PM
> To: Yasser Abdullah; 'Karim'; ccielab@groupstudy.com
> Subject: RE: Police/ rate-limit parameters concept confusion
>
> So a 1 second interval is assumed ? Or the Burst is in Bytes/second ?
>
> -----Original Message-----
> From: Yasser Abdullah [mailto:yasser@alharbitelecom.com]
> Sent: jueves, 15 de abril de 2004 16:02
> To: 'Karim'; ccielab@groupstudy.com
> Subject: RE: Police/ rate-limit parameters concept confusion
>
>
> Karim,
>
> First thing to remember when policing, burst is in Bytes (unlike
> Traffic-shaping). So if the ask you to allow a burst of 1/4 128K
(which
> is
> 32000 bits/sec) then you just need to change the burst size into
bytes.
> That
> mean 32000/8 = 4000 bytes.
>
> HTH,
>
> Yasser
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Karim
> Sent: Thursday, April 15, 2004 12:55 PM
> To: ccielab@groupstudy.com
> Subject: Police/ rate-limit parameters concept confusion
>
> Hi Group,
> Required to limit the ICMP traffic to 128K and allow a burst of 1/4 of
> this
> rate (128000).
>
> The offered solution:
> using Rate-limit is:
> access-list 100 permit icmp any any
> !
> interface Ethernet0/0
> rate-limit output access-group 100 128000 4000 4000 conform-action
> transmit
> exceed-action drop
>
> Using MQC:
> class-map match-all icmp
> match access-group 101
> !
> policy-map icmp
> class icmp
> police 128000 bc 4000 conform-action transmit exceed-action drop OR
> police
> 128000 4000 4000 conform-action transmit exceed-action drop !
> access-list
> 101 permit icmp any any interface fa0/0 service-policy output icmp
>
>
> I know that 4000 is taken from 128000/(8*4). I am confused, why it was
> solved as above, I was thinking to solve as follows:
>
> My solution:
> Using rate-limit:
> access-list 100 permit icmp any any
> !
> interface Ethernet0/0
> rate-limit output access-group 100 128000 16000 20000 conform-action
> transmit exceed-action drop
>
> Parameters calculated as follows:
> bc= 128000/8 = 16000. And for busting to 1/4 the 128K, set the be=
> 16000 +
> (16000/4) = 20000.
>
>
> Using MQC with the same previous parameters:
> class-map match-all icmp
> match access-group 101
> !
> policy-map icmp
> class icmp
> police 128000 bc 16000 be 20000 conform-action transmit exceed-action
> drop !
> access-list 101 permit icmp any any interface fa0/0 service-policy
> output
> icmp
>
>
> Can someone help, why didn't we use the second solution and why is it
> wrong
> ????????
>
>
>
> Thanks for your help,
> Karim.
>
>
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