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Vonage How do you tell whether or not the QoS is actually working? Simply enter the command
How do you tell whether or not the QoS is actually working? Simply enter the command "show policy-map interface" from enable mode on the router. You will see output like this. I'll explain each section:
Bunson#sho policy-map interface
FastEthernet4
Service-policy output: shaper <-this is the shaper, this lets you know how the interface shaping is going.
Class-map: class-default (match-any)
1297876 packets, 290952072 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
350000/350000 437 3500 0 10 437
Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 0 1281156 277127074 193027 110851465 no <-this tells you whether or not shaping is currently active. When you don't come near the levels you set, it will say its not active. When it is active it will let you know how many packets and how many bytes were delayed by the shaping. This is good because it indicates that you are handling the congestion on the router instead of overrunning the cable modem.
Service-policy : voice-policy
Class-map: voice-traffic (match-all) 340390 packets, 87771896 bytes <-This part tells you how many voice packets you've matched. This is important because it tells you that the quality of service is working. When you are on a call this will increment. Since the last time I reloaded the 871 it matched 340 thousand voice packets.
30 second offered rate 0 bps, drop rate 0 bps
Match: ip rtp 10000 10000
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 200 (kbps) Burst 5000 (Bytes)
(pkts matched/bytes matched) 1122/321197
(total drops/bytes drops) 0/0 <-You should check this value. For the voice-policy it should always be 0. If it isn't you need to increase the amount of bandwidth you specified in the "priority" statement under the voice-traffic section of the policy-map.
Class-map: class-default (match-any) <-This is everything else. All the rest of your data falls into this category.
957486 packets, 203180176 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 32
(total queued/total drops/no-buffer drops) 0/11961/0 <-You should see drops here. This is exactly what it sounds like, dropped packets. This is ok because if you drop a data packet you can always send it again. Resending a voice packet is worthless because you can rewind a conversation, it would sound bizarre.
Note, none of this applies to the audio coming inbound to your phone. You have no control over that.
Read The Full Thread: Cisco VOIP QoS for Vonage
• Hi everyone,
I'm posting this in hopes that it will help others configure
• Just to let you know this post was a huge help to me.
Thank you very much for taking
• Good stuff. That's a pretty standard config, but let me share a slightly different
• To Celeron (or EzCo),
Just curios, I am getting ready to take my ccna so all
• Doesn't matter what is behind the Cisco, it's just going to (outbound) priority
• So there's no way to do this without trying to match your upload speed? Is there
• No, you really have to make sure you enable shaping because the key point of QoS
• They are stacked and connected with two DTE/DCE cables right now. I put your example
• Class-map: class-default (match-any)
905660 packets, 369453629 bytes
Celeron posted "How do you tell whether or not the QoS is actually working? Simply enter the command" on 01/20/2006 |
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