DELL N3000 User Manual

Configuring Differentiated Services

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.

Internet

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Layer 3 Switch 

Operating as 

Router 1

Layer 3 Switch 

Operating as 

Router 2

Port 1/0/2

Port 1/0/3