VoIP & AutoQoS & frame/atm

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Mar 11th, 2009
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I have 2 remote locations connected via frame/atm links currently with no QoS configs and potentially running VoIP. Is AutoQoS the simpliest and/or best solution, for voip communication across the WAN(frame/atm) if no other QoS is required ?

Thanks for your consideration -

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paolo bevilacqua Wed, 03/11/2009 - 07:53
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No, I would recommend you manually configure QoS only after you have determined there is an actual need for it.

Joseph W. Doherty Mon, 03/30/2009 - 12:37
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" Is AutoQoS the simpliest and/or best solution, for voip communication across the WAN(frame/atm) if no other QoS is required ? "


"Simpliest", probably yes, "best", probably not.


For a fixed bandwidth inteface, such as a LAN port or WAN dedicated p-2-p port, a very simple QoS that prioritizes VoIP payload packets and guarantees bandwidth for signally packets, might be fine, but FR/ATM/MPLS WAN circuits often have other issues that AutoQoS won't likely deal with.

Nicholas Matthews Mon, 03/30/2009 - 12:51
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I'll admit that I haven't used AutoQoS on a WAN link, and definitely not on a FR/ATM interface.


I normally associate appropriate use of the AutoQoS command with L2 switchports, since the queueing on the switches is much more complex.


For routers, it's very simple, and there is a wider variance in how people use it.


In a very bare-bones scenario, you can get away with this:


class-map match-all voice

match protocol rtp audio


policy-map LLQ

class voice

priority percent 50

class class-default

fair-queue


int s0/0

service-policy out LLQ



You could make it more well rounded by matching on your VoIP signaling and other high priority traffic, but that's specific to your needs.



-nick

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