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zakfleming1
Beginner

VOIP QOS

Hello,

 

On the odd occasion our 100meg WAN circuits at our branch offices are getting maxed out and this is causing a few problems with VOIP.

 

I was thinking about using some QOS to solve this. Is it just a case of adding the below config onto the uplink port that the WAN circuit connects to please?

 

Thanks

 

switch(config-if)# priority-queue out
switch(config-if)# mls qos trust dscp
switch(config-if)# auto qos voip trust

 

2 REPLIES 2
Mark Malone
VIP Mentor

Hi
thats layer 2 qos , you should use llq/cbwfq qos for the wan circuits class-maps and polcy applied to wan interface , that config above is actually 2 types of qos , auto qos and mls qos , you would usually only use 1 type ,also priority-queue out will make sure all voip packets are serviced first in that before anything else can cause starvation of other queues if not careful in MLS , if using layer 2 qos with cisco phones i would just set mls qos trust dscp as the phones mark with EF DSCP at source and priorities then honor it in class-map with priority command so its carried through wan at bottleneck

This is what im talking about has an example too you could base your config off

http://blog.ine.com/tag/llq/

 

edit: when your looking at that example in your case the policy map would be applied to your wan interface so it can honor traffic going out