priority percent Command under Policy-map

[littlespace]

Hi,

I have a Cisco 3560 48PS (IOS 15.0-1.SE2)  and I need to have followin configuration:

Policy-map  VOIP_POLICY

   class VOIP
     priority percent 75

I already created VOIP class and VOIP_POLICY but when I go to policy-map setting to type      priority percent 75

I am not getting anything:

Switch(Config-pmap-c)#  Priority percent 75

%invalid Input detected at  .....

Could you please let me know how can i have that command under policy-map?

Thanks,

Mike

[Chris Deren]

Do you mind me asking why are you allocating 75% to priority queue, especially on a switch? What are you trying to accomplish, sure does not sound like a good QoS design?

Chris

[littlespace]

I have Shoretel VOIP and have found that number from their support. do you have better idea?

thanks,

Mike

[Chris Deren · Accepted solution]

I never worked with Shoretel but setting 75% of bandwidth surely guarantees they will not run into voice quality (sarcasm) assuming QoS is defined end to end.  Why are you setting LLQ policy on a  switch? Is this switch connecting to MPLS or other WAN? LLQ goes on a router and is typically configured on a router, switch configuration usually does marking, policing and queuing.

Cisco's best practive for LLQ priority queue is 33% of link, but obviously this all comes does to requirements and how big the link is.

Have you read Cisco SRND:

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSIntro_40.html

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSCampus_40.html

HTH, pleae rate all useful posts!

Chris

[littlespace]

Thank you Chris for your reply. the switch is just a LAN switch. do you have a sample config for cisco 3560 switch VOIP QOS?

Thanks,

Mike

[Chris Deren]

The link I included provides config examples, however QoS is a large topic and you cannot configure it on one switch without considering the entire network as misconfiguring QoS does more damage than no QoS at all. If you just want to slap a config on a switch from someone else without understanding it, I strongly advise you against it as I've seen too many bad episodes of this. If you want to do this yourself make sure you read up on it and understand it, if you don't have the time or energy hire a professional, trust me you will do yourself a favor.

HTH, pleae rate all useful posts!

Chris

[littlespace]

I just have 2 x 6509 and 1x3560 switch all connected to each other with gig ethernet.

[littlespace]

right now on cisco 6509 I have following config on each port and it is working fine:

wrr-queue bandwidth 30 70

wrr-queue queue-limit 30 70

wrr-queue cos-map 1 1 1

wrr-queue cos-map 1 2 0

wrr-queue cos-map 2 1 2 3 4 6 7

wrr-queue cos-map 2 2 5

mls qos trust cos