From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Jul 06 2007 - 12:12:34 ART
Bit Gossip,
On 3560s, Q-sets are only used for egress Queueing. Think of Q-sets as
templates. By default, Q-set 1 is assigned to all interfaces, so what ever
configuration you assign to Q-set 1 will automatically be inherited by all
interfaces, whereas, Q-set 2 can be configured separately and then it can be
assigned to a given interface or bunch of interfaces (interface range) by
entering the "Queue-set 2" in the interface configuration mode.
Remember on 3560s, you can NOT have different WTD and/or Buffer values for
each interface, because WTD and Buffers are configured through the
Queue-sets and there are only two of them.
On 7/6/07, Mike Kraus (mikraus) <mikraus@cisco.com> wrote:
>
> This is a good comparison point between the 3550's and the 3560's. On the
> 3550's you can have different buffer/threshold parameters per port.
>
>
> *****
>
> Ex. On 3550:
>
> interface X/Y
> wrr-queue queue-limit 40 30 20 10
>
> - The above assigns 40% of the buffer space to queue 1, 30% to
> queue 2, 20% for queue 3, and 10% for queue 4 for that interface. Each
> interface can be configured independently.
>
> ******
>
> Ex on 3560:
>
> mls qos queue-set output 1 buffers 40 30 20 10
>
> - The above assigns 40% of the buffer space to queue 1, 30% to
> queue 2, 20% for queue 3, and 10% for queue 4. Then you apply this to an
> interface.
>
> interface X/Y
> queue-set 1
>
> - As a result this maps the defined queue-set to this port. In
> other words, you can only have two different sets of queues for each port
> (each port is either in queue 1 or queue 2. You are not able to have
> different buffer/threshold settings for each individual port. Now, for
> bandwidth on egress, that still is done on a port by port basis.
>
> *****
>
> Keep in mind, the normal comment that queue 4 of the 3550 is the priority
> queue, where queue 1 is the priority queue of the 3560. The queue-set
> concept applies only to the 3560 and applies to both buffers and
> thresholds. See slide 42 here for a comparison of WRR vs. SRR.
>
>
> http://www.cisco.com/application/pdf/en/us/guest/products/ps5023/c1161/ccmigration_09186a0080161372.pdf
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jvrg Buesink
> Sent: Friday, July 06, 2007 3:24 AM
> To: Bit Gossip
> Cc: groupstudy
> Subject: Re: SRR qset-id
>
> Hi
>
> As far as I can remember you can set different for queue set 1 and queue
> set 2.
> This means that by assigning queue set 1 to an interface x and queue set 2
> to interface y, they have different SRR parameters (buffers etc), so more
> flexible.
>
> Regards,
>
> Jorg Buesink
> CCIE#15032 [SP, R&S]
> http://www.jorgbuesink.nl
>
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832
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