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Need help with QoS / CoS configuration

I have a customer that I am trying to help out with their current equipment. They have 2 sites, main site has a 2801 router, dell managed switches and a panasonic voip system. The remote site has the same phones, a netgear switch and a cisco 1841 router. The main site and remote are connected by a mpls network through their service provider. The main site is the Internet connection and phones for the remote site. The main site phones have no problem, mainly b/c they are connected directly to the pbx. The remote site's Internet and phone service is provided by the main site over the MPLS connection. The remote site has problems with the voice service, mainly b/c QoS is not setup. We are currently trying to find out if the panasonic phone system is tagging the voice traffic. I am trying to setup some sort of class-map, policy-map, is this possible with this setup or am I just wasting my time without them having the correct gear to get the job done correctly. Any help would be greatly appreciated... See attachment for diagram.


Re: Need help with QoS / CoS configuration


You should be able to get some improvements with their current equipment.

First thing to check though, is to make sure that your customer has subscribed to the correct type and amount of bandwidth on the MPLS link. You then need to know how the service provider classifies the different type of traffic, this will allow you to work out how to classify and mark the traffic on your 2801 and 1841.

If you dont know what the PBX is sending, then the easiest way to work it out is to get a packet sniffer to check out what is going in and out of the PBX network interface. I suggest using Ethereal, its free.

You should be able to use a combination of the source IP address of the PBX, and the TCP / UDP port numbers to help you classify and re-mark the traffic if required.



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