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Beginner

QOS priority police and remaining bandwidth

Hello Team,

I would like to better understand of behavior of my QoS. I have configured class with priority, and then with police. Lower classes are configured with "bandwidth remaining percent" command.

policy-map TRAFFIC-OUT-Gi0/0.7
 class OUT-VOICE
  priority
  police 8608000 1076000 1076000 conform-action set-dscp-transmit ef exceed-action drop
 class OUT-VIDEO
  bandwidth remaining percent 20
  police 6008000 751000 751000 conform-action transmit  exceed-action drop
  queue-limit 256 packets
 class OUT-DATA
  bandwidth remaining percent 79
   service-policy OUT-D1-Gi0/0.7

My question is, will share class OUT-VOICE its free bandwidth if OUT-DATA class is fully utilized? Or OUT-VOICE bandwidth is not shareable in this configuration?
I have issues, data class is dropping too many packet even the link is not fully utilized.

 

Thanks for help.

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1 ACCEPTED SOLUTION

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VIP Expert

Re: QOS priority police and remaining bandwidth

"My question is, will share class OUT-VOICE its free bandwidth if OUT-DATA class is fully utilized?"

I believe it should.

"I have issues, data class is dropping too many packet even the link is not fully utilized."

Often that's a symptom of bursty traffic, i.e. the available bandwidth is overrun during a microburst, drops happens, TCP goes into CA. (See classic TCP saw tooth bandwidth graphs.)

Increasing your class OUT-DATA buffers might reduce drops.

View solution in original post

1 REPLY 1
Highlighted
VIP Expert

Re: QOS priority police and remaining bandwidth

"My question is, will share class OUT-VOICE its free bandwidth if OUT-DATA class is fully utilized?"

I believe it should.

"I have issues, data class is dropping too many packet even the link is not fully utilized."

Often that's a symptom of bursty traffic, i.e. the available bandwidth is overrun during a microburst, drops happens, TCP goes into CA. (See classic TCP saw tooth bandwidth graphs.)

Increasing your class OUT-DATA buffers might reduce drops.

View solution in original post