Traffic police problem on C6840-X-LE-40G

[AmirHosseinKamrani]

Hello 

in our company, we have two C6840-X-LE-40G that are VSS and we want to police traffic on this Switch. I searched and found out that we should use the below command so that the shape works correctly 

# platform qos police distributed loose/strict

After entering the command, the device gets into trouble and all the services suffer from packet loss.we had to remove the command, 

our version is c6848x-adventerprisek9-mz.SPA.155-1.SY1.bin 

noted: this config works on Cisco 6816 series with same IOS and only on C6840 do we have this problem. 

I know that many people may not have experienced this problem, but I wanted to use everyone's experience by expressing it in this forum.

[marce1000]

 - Use latest advisory software version : https://software.cisco.com/download/home/286287226/type/280805680/release/15.5.1-SY11  and try again , 

 M.

[Georg Pauwen]

Hello,

chances are you are hitting the bug below:

Agg. policer with 'platform qos police distributed' drops all traffic
CSCuh94242
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Description
Symptom:
++ Output rate on egress interface where policed packets go out of, shows 0 packets/sec

QOS_RECREATE#sh int gig3/1 | i rate >>>>>Ingress 60 Mbps
Queueing strategy: fifo
30 second input rate 60000000 bits/sec, 4166 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
QOS_RECREATE#sh int gig4/3 | i rate >>>> Egress 0 mbps
Queueing strategy: fifo
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec

++ 'sh policy-map int <>' shows all traffic as exceeded
QOS_RECREATE#sh policy-map int gig3/1
<snipped>
police aggregate 3501 :
9000000 bps 281250 limit 281250 extended limit
<snipped>
aggregate-forward 0 bps exceed 60688800 bps

Conditions:
++ On applying 'platform qos police distributed ' command.
++ Seen with random combinations of policer values/ingress rates/packet size/burst value.
This can be seen if there is no DFC in the chassis and we enable distributed policing.

Workaround:
Removing 'platform qos police distributed' command.
Changing the burst value also is a workaround.

[AmirHosseinKamrani]

Thanks Georg Pauwen 

but is there any solution for this ? 

[marce1000]

                                >...but is there any solution for this ? 
               Ref : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuh94242
                             Look for Known Fixed Releases !