From: dave dave (funccie@gmail.com)
Date: Fri Mar 13 2009 - 15:02:20 ARST
Hi Joseph & All Expert,
Thanks Joseph for sharing your experience. I laso wanted to know if i stick
to PFC QoS with PQ, how can i ensure in 100% of voice traffic load also i
can configure my box such a way that my Control Plane traffic wont lost...is
it possible????
Regards
Dave
On Fri, Mar 13, 2009 at 5:17 PM, Joseph L. Brunner
<joe@affirmedsystems.com>wrote:
> This has never been in an issue in over 100 sites I have worked on,
> deployed and tested the 6509E, etc.
>
> My experience, no matter how hard you are driving the network (oracle rac,
> sun backups, Symantec backups, etc) the 6509 always has another 50 to
> 100Mbps to give...
>
> We once tried this (you'll like this)- a perl script to dump data from 3
> Redhat boxes to a single port where a cisco ip phone was on a 6509 Gigabit
> port... I wanted to convince management to invest the consulting hours in a
> qos deployment on about 9 6509E's... I could not get the voice call to
> jitter at all... he was on the phone with me talking fine even under that
> stress (and the packets it made it there, per span!!!)
>
> Like I said these switches always have something more to give even on the
> cheaper non-server asic'd blades... seems it doesn't let anyone flow use it
> all.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> dave dave
> Sent: Friday, March 13, 2009 4:47 AM
> To: Cisco certification
> Subject: [Real World] 6500 QoS making me crazy..:(
>
> Hi Expert,
>
> *Catalyst 6500 Release 12.2SXH *
>
> SERVER-|-ACCESS-Router---L2-link---1g----------|
> |
>
> SERVER-|-ACCES-Router---L2-link---1g-------------|---*1g--Dis-SW6500---10g*--------L2-Link--------------------------Core
> Router
> |
> SERVER-|-ACCES-Router---L2-link---1g-------------|
>
>
> If i configure priority Queue which can take 100% BW, so it means priority
> traffic from different Access-Router aggregated to 100% of uplink of
> Aggregation switch to Core roure , all other traffic including control
> plane
> will be dropped. Is there is any work around for this. I can only do
> hardware-switched QoS.
>
> 6500 QoS
>
> http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/qos.html
>
> 6500 QoS Note from above URL
> For hardware-switched traffic, PFC QoS does not support the bandwidth,
> priority, queue-limit, or random-detect policy map class commands. You can
> configure these commands because they can be used for software-switched
> traffic.
> Does it mean that i need to disable mls switching to do the harware based
> swithing. I cant do the software based switching because that will not be
> good for the heavy traffic load considering my network, which may put hugh
> CPU load on my 6500 aggregation box.
>
>
> Regards,
> Dave
>
>
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