Diffserv For Voip - NETGEAR GSM7228PS Software Administration Manual

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.
Layer 3 switch
operating as Router 2
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
190 | Chapter 12. DiffServ
Port 1/0/2
Layer 3 switch
operating as Router 1
Port 1/0/3
Internet
ProSafe 7000 Managed Switch Release 8.0.3