From: McCallum, Robert (robert.mccallum@thus.net)
Date: Wed Oct 22 2003 - 09:08:51 GMT-3
Ken,
The bandwidth command is the % bandwidth of the max bandwidth of the interface i.e. default 75% so when you specify 25% to go into a certain queue it is indeed 25% of 75% of interface bandwidth.
Robert McCallum
CCIE #8757 R&S
01415663448
07818002241
> -----Original Message-----
> From: Ken.Farrington@barclayscapital.com
> [mailto:Ken.Farrington@barclayscapital.com]
> Sent: 22 October 2003 12:24
> To: ccielab@groupstudy.com
> Subject: RE: CBWFQ - Reseving BW for Voice
>
>
> fantasic. so if I were to get an excecise with the
> percentages above the 75%, even thou the policy map will
> accpt the command, just the fact that they have given me an
> excersise totals more than the 75%, i must use the
> max-bandwidth command to 100, of what ever the total in the
> excercise is? Personally, I would set to the percentage
> maximum they have specified?
>
>
> correct?
>
> thx soo much for you help !!!
>
>
> -----Original Message-----
> From: David Bartlett [mailto:David.Bartlett@reuters.com]
> Sent: 22 October 2003 12:00
> To: Ken.Farrington@barclayscapital.com; ccielab@groupstudy.com
> Subject: RE: CBWFQ - Reseving BW for Voice
>
>
> Ken
>
> Yes, you should use LLQ's priority queue for voice traffic to
> ensure minimal delay variations. For this exercise you must
> set max-reserved-bandwidth to 100% as you suggest as the
> default max is 75%. If no class-default is configured, then
> traffic not matched by your ACLs will not be dropped but will
> use the remaining 10% bw and be given best effort treatment.
>
> Another important point to understand with LLQ is that using
> the bandwidth statement specifies the *minimum* bw that the
> class can use during periods of congestion. However, on the
> priority queue the bandwidth specifies the *maximum* bw that
> the queue can use during congestion periods. The priority
> queue is policied and traffic exceeding the configured bw
> will be dropped.
>
> Hope this helps,
>
> David Bartlett
>
> -----Original Message-----
> From: Ken.Farrington@barclayscapital.com
> [mailto:Ken.Farrington@barclayscapital.com]
> Sent: 22 October 2003 11:47
> To: ccielab@groupstudy.com
> Subject: CBWFQ - Reseving BW for Voice
>
>
> All,
>
> Good Morning,
>
> Please can I confirm a couple of points.
>
> On the excersise below, Should I use for voice traffic, the
> priority keyword as this I beleive invokes LLQ or should i
> just use bandwidth (i think this may cause delay in the
> queing of voice data and is not a good
> idea?)
>
> What happens if I do not specify max-bandwidth on the
> interface to 100 as my %s total 90% - Is this 90% of the 75%
> that is used by default?
>
> If I dont specify a class-default, does all other traffic get
> denied, or is just quese in the remain 25 percent reserved
> for other traffic?
>
>
> Please if someone could help me on these points, it would be fantasic.
>
> Many thx,
> Ken
>
>
> I have an excercise to do the folloiwng
>
> Users on a that share a serial line, should have the
> following restrictions
> :-
> 35% FTP Traffic
> 25% Telnet Traffic
> 30% Voice Traffic
>
> so, using CBWFQ config as below
>
> map-class voice
> match access-group 100
> map-class telnet
> match access-group 110
> map-class ftp
> match access-group 120
>
> policy-map traffic
> class voice
> priority 30
> class telnet
> bandwidth 25
> class ftp
> bandwidth 35
>
>
> acess-list ............
>
>
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