From: Ken.Farrington@barclayscapital.com
Date: Wed Oct 22 2003 - 10:57:48 GMT-3
I am really sorry to e-mail again on this topic, but my head is about to
explode.
(imagine its a 1Mbps cct)
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, If I am asked a question such as the above,
I should set the max-reseve-bandwidth to 90 on the interface, and configure
the queing as such?
policy-map traffic
class voice
priority 300
class telnet
bandwidth 25
class ftp
bandwidth 35
now when I configure queueing and I have put the voice traffic into a strict
LLQ, now my percentages change dont they?
ie, we now have only 700k to play with for CBWFQ (imagine its a 1Mbps cct)
and PLEASE NOTE, that i cant seem to find a "priority percent" command for
LLQ - I assume one does not exist, so you have to specify LLQ in Kbits only.
Is the 300k for voice correct, as I have calulated this as 30% of the total
cct bandwidth, or should it be 30% of 900k as the max-reserved-bandwidth is
set to 90.
Also, I dont now know if I should adjust my telnet and FTP percentages to
25% of 700k or 25% of 600k as is the remaining bandwidth total-bandwidth
minus LLQ reserved BW or 90% of the bandwdith minum LLQ reserved BW or will
this just be done automatically? and I just leave these alone?
I am just about to go jump in a lake :(
Im sorry to persist with this, but I gues we must have a clear understanding
of this for the lab.
Many thx
-----Original Message-----
From: McCallum, Robert [mailto:robert.mccallum@thus.net]
Sent: 22 October 2003 13:09
To: 'Ken.Farrington@barclayscapital.com'; 'ccielab@groupstudy.com'
Subject: RE: CBWFQ - Reseving BW for Voice
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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