From: simon hart (simon.hart@btinternet.com)
Date: Sun Feb 13 2005 - 06:57:40 GMT-3
Hi,
No argument on the Default Class. The Default Class by its nature can
support FWQ, and as you have pointed out a number of dynamic queues can be
assigned.
You assumption on non-default classes is incorrect. These classes/queues do
not use FWQ, you will find that you are unable to issue the command
fair-queue under any non-default class.
Therefore each class is a queue in itself. All flows within the non-default
queue will be treated as FIFO and Tail Drop (unless WRED invoked). This
should not present a problem, as you should group like for like traffic
within each non-default class.
The depth of the queue for Non Default Class is 64 packets. The number of
queues is one.
The queue depth can be modified with the queue-limit command (note the
default is different if you are using a VIP based platform).
The number of queues for the default-class with fair queue is a function of
the interface bandwidth. You should refer to the Doc Cd for this, however
as an example bandwidth of less than 128k will equate to 16 dynamic queues.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos
_r/qrfcmd1.htm#wp1097851
The depth of each queue is by default 64 packets. This, as before, can be
modified with queue-limit
HTH
Simon
-----Original Message-----
From: Hans None [mailto:acsyao@hotmail.com]
Sent: 12 February 2005 22:35
To: simon.hart@btinternet.com; ccielab@groupstudy.com
Subject: RE: Class-Based Weighted Fair Queueing
Hi Simon,
Thanks for your reply.
What I think is there are multiple queues assocaited with the default class.
See the following:
Router(config-pmap-c)# fair-queue [number-of-dynamic-queues]
Therefore I further assume there should be multiple queues associated with
non default class.
I think the key factors here are for each class are: number of queues and
the size of the queue.
Correct me if I am wrong.
Thanks,
Yuhui
>From: "simon hart" <simon.hart@btinternet.com>
>To: "Hans None" <acsyao@hotmail.com>,<ccielab@groupstudy.com>
>Subject: RE: Class-Based Weighted Fair Queueing
>Date: Sat, 12 Feb 2005 13:03:50 -0000
>
>Hans,
>
>Not sure I fully understand you question, but here we go.
>
>When you define a class other than the default-class and you input the
>bandwidth command, then this class is just one queue in itself.
>
>So the class/queue is treated as FIFO with Tail Drop. The Tail drop
>behaviour can be modified with introduction of WRED. The important point
>to
>note is that each Class (other than Default) is FIFO.
>
>Now the Default-class can be configured with Fair-queue. By adopting this
>method on the default class, all traffic heading for this queue will be
>treated in the classical Fair queueing method - ie traffic will be
>identified into flows and weighted on precedence and packet size.
>
>
>Simon
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Hans None
>Sent: 11 February 2005 02:09
>To: ccielab@groupstudy.com
>Subject: RE: Class-Based Weighted Fair Queueing
>
>
>All,
>
>Still have questions on this one.
>
>Normally when class is defined, the number of queues and the size of each
>of
>individual queue are associated with that class. This is show in the
>default
>class configuration
>
>However, for the non default class, the size of the queue is defined by
>wred, but how is the class associated with the number of queues? Is that
>related to the "bandwidth" commnad?
>
>Thanks,
>
> >From: "Hans None" <acsyao@hotmail.com>
> >Reply-To: "Hans None" <acsyao@hotmail.com>
> >To: ccielab@groupstudy.com
> >Subject: Class-Based Weighted Fair Queueing
> >Date: Wed, 09 Feb 2005 22:18:30 +0000
> >
> >Hi all,
> >
> >
> >What does the bandwidth command mean here? Is it going to define the
> >numbers of queues allocated?
> >
> >Router(config-pmap-c)# bandwidth {bandwidth-kbps | percent percent}
> >
> >
> >Thanks,
> >
> >
> >Hans
> >
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