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Vonage Hi everyone,
I'm posting this in hopes that it will help others configure
Hi everyone,
I'm posting this in hopes that it will help others configure their Cisco routers to provide the proper quality of service configuration for Vonage. Below you will find the necessary configuration and explanations of each particular section. Enjoy!
Topology:
Internet-Cable modem-ethernet-Cisco Router-ethernet-vonage phone adapter-phones
This configuration should work in just about every version of IOS from 12.2 mainline and above. Note, the traffic shaping my not be available on every platform or feature set.
To configure the QoS for Vonage you don't have to do a whole lot. Here's the configuration you need:
!
class-map match-all voice-traffic
match ip rtp 10000 10000
!
!
policy-map voice-policy
class voice-traffic
priority 200
class class-default
fair-queue
policy-map shaper
class class-default
shape average 350000 3500 0
service-policy voice-policy
!
interface <name of your WAN interface>
service-policy output shaper
!
The above configuration was taken directly from my router. I'll explain each portion of the above config so you know what it's doing.
a. The class map defines what type of packets you want to specify for quality of service. In this case the class-map is specifying all RTP packets, start at port 10000, for a range of 10000 ports. So in essence, any RTP packets to ports 10000-20000 will be targeted for quality of service.
b. The policy-map voice-policy is how you define how much bandwidth each class gets. In this case the voice-traffic class (the one I defined in the class-map) is getting 200kbps of bandwidth. This is more than enough for a single Vonage phone call (at the 90k setting). Specifying more than necessary doesn't hurt anything as it will only reserve the bandwidth if needed. Class-default is all your other traffic. Here we aren't specifying any bandwidth to be reserved, as such it will be handled in a standard fair-queueing type fashion where each traffic flow will be given an equal portion of the remaining bandwidth.
c. The policy-map shaper is VERY important. This slows down your interface to the speed of your upload stream. In most cases, your cable modem will have an Ethernet or Fast Ethernet connection to your router. Quality of service on kicks in only when a link is congested. If you don't slow down the connection to the cable modem itself the congestion will happen on the cable modem instead of the router. You don't control the cable modem, so you need to handle the congestion on the router. The shape average command is how you define how much you want to limit the interface. In this case I've specified 350kbps, 350000. The next value should always be a 100th of the first, hence the 3500. The last value should ALWAYS be 0. So, for example, if your upload speed 230kbps the command would be "shape average 230000 2300 0". The service-policy voice-policy hooks the bandwidth settings you've configure for your voice traffic to the policy-map you are using to slow the interface down.
d. Lastly, you need to apply all this to an interface. As such, I've applied the service-policy, shaper, in the outbound direction on this interface.
What will all this stuff do? Well, assuming your upload speed is sufficient, you can do whatever you want on your connection, from an upstream perspective, while talking on the phone and the person you are talking to will never notice. Slowing the interface down will also decrease your overall upload speed. This is a small price to pay to ensure good, consistent voice quality to the people you call.
Read The Full Thread: Cisco VOIP QoS for Vonage
• How do you tell whether or not the QoS is actually working? Simply enter the command
• 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 "Hi everyone,
I'm posting this in hopes that it will help others configure" on 01/21/2006 |
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