Quality of service issues

All,

I installation of our system of QOS after the excellent tutorials of Brad Hedlund.  However, it doesn't seem to work for me.  I defined the class gold with a weight of 4 and a MTU of 9216.  I then created a QoS policy using the class gold with a burst of 10240 and rate line for the rate.  Host control is set to none.  I then apply the policy to the console of my service and my MTU value 9000.  I have problems with ESXi and Windows 2008 R2.  I can ping another host with a size of standard image without any problems.  If I ping with a packet size of 8000 I get an error "timeout exceeded demand.  However, if I change the MTU of the better class to 9216 it pings with package jumbo very well.  If I change back to normal best-effort, jumbo pings expire.  It seems that the policy is not applied, there is an error, or system is defaulting to the best-effort class and not using the strategy I created.  No idea where to start my troubleshooting?

Thank you

Ken

Ken

If she works within the UCS and not beyond then it's explainable which is the reason why I was asking you abt the 2nd Server.

UCS CoS function QoS that is based on the CoS, we follow treatment is completed.

When you have 2 blades in UCS, you have the same strategy QoS defined i.e. jumbo frames are allowed on CoS 4 (as an example).

When you go beyond UCS, the QoS policy is not there.

When you run a ping of 9000 allows size package say, the echo ICMP message dating as 9000 (data) packet size.

The return (Echo reply) is also with 9000 package size. The return must work for ping succeed.

When you ping to the external server, the package reached it very well I don't like political QMS brand with CoS 4 and jumbo frames are enabled.

The return is coming CoS 0 (i.e. undefined) who will at best is still on the side of the UCS 1500 and will be trampled.

That's why you need to activate jumbo on the better class allowing the return package and treatment to give within the UCS.

We don't allow UCS marking on the penetration of uplinks. But if you were to mark the upstream with CoS 4 traffic, it will work.

You can open a TAC case too... but I'm sure that the explanation will be the same.

Thank you

-Matt

Tags: Cisco DataCenter

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