From: Digital Yemeni (digital.yemeni@gmail.com)
Date: Mon Mar 26 2007 - 21:28:44 ART
Yup that's right! Even the priority queue of both switch differ! On the 3550
queue 4 is the priority queue while on the 3560 queue 1 is! You can go thru
the book referenced by Bob! It's reaaaaaaaaally a great book for QoS!
On 3/27/07, Gary Braver <gbraver@fastlanenetworks.com> wrote:
>
> Bob
>
> Great write up. One question: I thought the 3560 also based QoS
> decisions
> on an internal DSCP value with the value being set by a combination of the
> frames DSCP to CoS mapping value and the per interface Cos to Queue
> mapping.
>
> I guess it gets very confusing, especially to me when one platform uses
> one
> sytax and another uses a different.
>
> So to prepair for the lab one should configure lan qos on both 3550
> (wrr-queue statements), and 3560 (srr-queue statements)?
>
> Thanks
> Gary
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Bob
> Sinclair
> Sent: Sunday, March 25, 2007 9:09 AM
> To: Digital Yemeni
> Cc: ccielab@groupstudy.com
> Subject: Re: 3560 SRR
>
> Digital Yemeni wrote:
> > Hi group,
> >
> > I know that we can set the CoS mapping via the "wrr-queue cos-map"
> interface
> > command on the 3550. Since this command is not available on the 3560,
> how
> > can we do it on a 3560 interface?
> >
> > The "mls qos srr-queue input cos-map" is only a global command as far as
> i
> > know! is there any way to set it as per interface on the 3560?
> >
> > Thanks in advance!
> >
> >
> Just to confirm, there is no way to do per-interface cos-maps on the
> 3560. For reference, here are some other QoS differences between the
> 3550 and the 3560:
>
> The 3550 permits per-interface specification of buffer depths, whereas
> the 3560 allows you to create two queue-sets globally then apply one of
> the queue-sets per-interface. The queue-set allows you to configure
> buffers, not cos-to-queue mappings.
>
> The 3550 permits input and output service policies. The 3560 permits
> only input service policies.
>
> The 3550 priority queue out is queue 4, the 3560 priority queue outbound
> is queue 1.
>
> The 3550 does not support traffic shaping, the 3560 does.
>
> The 3550 permits a direct vlan match in a class-map, the 3560 uses
> hierarchical policies applied to an SVI for vlan matches.
>
> The 3550 does not provide configurable drop thresholds on FE ports, the
> 3560 does.
>
> The 3550 maps traffic to queues based on CoS value, the 3560 can also
> map traffic to queues based on internal DSCP value.
>
> The 3550 does not support output bandwidth limits per port, the 3560
> does. (However the 3550 has output policing matching on DSCP)
>
> Tim Szigeti's book "End-to-End QoS Network Design" has a table comparing
> QoS features on the Catalysts at page 264.
>
>
> --
>
>
> Bob Sinclair CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
> _______________________________________________________________________
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>
-- Best Regards! Digital, CCIE# to be assigned by Cisco when it collects enough $$ out of me! :p
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