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Troubleshoot QOS in packet drop

Hello guys,

need your help to understand below enlighten.

last day i got issue from one of our customer where he reported issue in voice traffic.

i checked further step and finally i got that packet drop is due to voice packets are exceeding.

i have some logs to analyse here also.

sh policy-map interface Gi0/1.500 output | s VOICE

Class-map: VOICE-IPPREC (match-all) 

          52232824 packets, 10058495921 bytes

          30 second offered rate 132000 bps, drop rate 0000 bps

          Match: ip precedence 5

          Priority: 4096 kbps, burst bytes 102400, b/w exceed drops: 2940

above we can see - b/w exceed drops: 2940

it's a 4 mb b/w assigned to voice class.

i am confused here 2940 is what? is it bps or kbps or packet count ?

because customer is asking how much bandwidth should be increase for voice class to resolve the packet drop issue.

we can recommend to increase b/w of  this class to 5 mb or 6 mb but i need to know exact calculation, how to calculate this ?

Please help to understand this. Thanks :) 

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Cisco Employee

Hi Ashhad,

Hi Ashhad,

The drop count is for total number of packets dropped due to exceeding BW.

Simple way to increase the BW is by trial error. Otherwise if they have any reports of rate of voice traffic sent then that can be used to change your policy-map.

regards

Ashish

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