190 | Chapter 12. DiffServ
ProSafe 7000 Managed Switch Release 8.0.3
DiffServ for VoIP
One of the most valuable uses of DiffServ is to support Voice over IP (VoIP). VoIP traffic is
inherently time sensitive: For a network to provide acceptable service, a guaranteed
transmission rate is vital. This example shows one way to provide the necessary quality of
service: how to set up a class for UDP traffic, have that traffic marked on the inbound side,
and then expedite the traffic on the outbound side. The configuration script is for Router 1 in
the accompanying diagram: A similar script should be applied to Router 2.
Port 1/0/2
Internet
Layer 3 switch
operating as Router 2
Port 1/0/3
Layer 3 switch
operating as Router 1
Figure 21. Diffserv for VoIP in Router 1
The example is shown as CLI commands and as a Web interface procedure.
CLI: Configure DiffServ for VoIP
1. Enter Global configuration mode. Set queue 5 on all ports to use strict priority mode.
This queue will be used for all VoIP packets. Activate DiffServ for the switch.
(Netgear Switch) #config
(Netgear Switch) (Config)#cos-queue strict 5
(Netgear Switch) (Config)#diffserv
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