I came across that in my research but I was wondering if anyone actually had any experience applying QOS to an etherchannel interface (or the physical interfaces) and what practices worked for them.
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QOS on an Etherchannel interface for Cisco 3750
How would one go about prioritizing voice traffic on an etherchannel interface on a Cisco 3750?
I'm not sure of SRR can be applied on an etherchannel interface, or if its better to apply it to the physical interface, or just to create a policy map and apply it to the etherchannel interface (if possible).
Thanks for any help.
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Answers
the common practice is to define where your trust boundry is and define QoS there, trust it on uplinks and set policy on lower bandwidth interfaces like WAN links.
I would do a modified QoS on access ports and then typically carve out 4 or 5 queues on the WAN and not worry about trunks or etherchannels just trust the dscp values on traffic passing over them. typically the WAN QoS will carve out 1/3 of the bandwidth for voice and on a 4 Gig ether channel that would be 1.33 Gigs... which would be appropriate if you wanted to allow for one half of a college campus to call the other half at the same time. me thinks not so much in the deploymets I touch.
hope this helps,
-t
Thanks to the both of you for responding.
I guess where I'm going with this is that if a situation should occur where there is congestion on the etherchannel interface, I would want it to prioritize voice traffic over data traffic, is there a recommended way to do this?
Am I wrong in thinking this way? I don't want to do more harm than good but my client really wants to be sure that voice traffic will get priority in any situation.
in the simplest qos deployment by configuring qos on all the switches and classifying the traffic at the switchport using auto qos the voice traffic will be prioritized based upon the default hardware queues defined on each switch. the software queues where you have to allocate specific bandwidth to each class of service is on routers only.
if you have congestion on an etherchannel that is impacting voice services than you have bigger issues than qos.
-t
for more info on what you can do with QoS you might want to check out the Enterprise QoS Solution Reference Network Design Guide from Cisco at http://www.cisco.com/unive
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by: cat6509Posted on 2008-12-05 at 14:37:53ID: 23109520
"If you have EtherChannel ports configured on your switch, you must configure QoS classification, policing, mapping, and queueing on the individual physical ports that comprise the EtherChannel. You must decide whether the QoS configuration should match on all ports in the EtherChannel. "
http://www.cisco.com/en/US
Have fun with that one. ;)