Question : Cisco QOS - Police Questions

Hi All,

WOuld be of great help if anyone can help me answer the below questions so that i can better understand the QOS.

- Below is the Police we have set for Voice Traffic. Based on my understanding that the Voice Traffic can have a maximum of 884Kbps and in case of any congestion it will be gurantted a 884Kbps any time. But what does the 8000 Burst Bytes do? I have read few papers saying that the 8000 is the size of the token bucket? If it is the size of the token bucket , is there a token bucket created for each flow(means each source and destination IP with port) or the whole class has onlyi one token bucket size of 8000 bytes? Also on what scenarios can we actually full up the 8000 bytes? Because today we are seeing a lot of drop packets beacuse of this police. But the problem is the 884kbps is never full and not sure if the 8000 is somehow dropping the packets.

 police 884000 8000 conform-action set-dscp-transmit ef exceed-action drop
  priority 884

Also does the priroity 884 means it will never allow the other class to use that 884kbps even when there is no utilization for the Voice Class? Is it just reserverd for it.

Thanks
Hari

Answer : Cisco QOS - Police Questions

The token bucket is a fixed value -- it is not per stream.

I typically set my burst to 10% of the bandwidth/priority value specified.  I recommend changing the burst to 88400.

'priority' does reserve that amount of bandwidth for that policy.  Your other option is to use a 'bandwidth percent' value.