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9.0

Using multiple VLANs to separate VoIP from data traffic and testing QoS

Asked by norcotek in Voice Over IP, IP PBX Systems, Networking

We have just completed a network design that is intended to run both data traffic and VoIP traffic from a Call Centre. The backoffice which has the call centre workstations and the VoIP phones (polycom) connect with the Data Centre over an Ethernet fibre link, between the sites we have Cisco 3750 swtiches.

The network was designed so that we have separate VLANS: one exclusively for the VoIP related traffic and others for different data traffic. Only the VoIP phones will use the VoIP VLAN for the SIP messages and the RTP traffic.

We just completed a QoS certification process with a subcontractor that used VoIP call simulators to load the VoIP VLANS. They placed these simulators at each end (Data Center and Backoffice). And they pumped a lot of VoIP calls over the link for several days ane they did QoS measurements.

At the same time, we were asked to load the network with data traffic to try to reach congestion and "stimulate" the QoS setting in the switches to ensure that QoS was being done properly. We did pump a lot of data traffic on the network using data simulators, but of course, this traffic was on the data VLANS (not on the VoIP VLANs).

The result from the QoS tests was the followong: almost perfect QoS results, no delay, no jitter, etc. Almost too good to be true.

The question I have is this: Is it possible that even if we were loading the network with data traffic that this traffic was unable to "congest" the VoIP links becuase they are on totally separate VLANS?

The VLANs have been defined at the port level, so from a logical perspective the VoIP traffic should never "mix" with the data traffic.

Shoudl I be suspicious of having such "clean" QoS results?

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Using multiple VLANs to separate VoIP from data traffic and testing QoS

Asked by norcotek in Voice Over IP, IP PBX Systems, Networking

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