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Chapter 7
Scenario 1: Residential user.
E-NIT-CTC-20041213-0013 v0.5
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7 Scenario 1: Residential user.
Introduction In this chapter describes an example of how IP QoS might be used in a typical
residential user scenario.
This user uses the following applications:
A VoIP device that uses Expedited Forwarding (for example the ST190)
A Windows application that uses Assured Forwarding (AF for example
Messenger)
An interactive Windows application (for example Web surfing)
Windows applications that use Best Effort as client (for example peer-to-peer
program) and as server (for example an FTP server).
Expected result In this case the desired behavior is that the EF traffic has strict priority on the AF-
and-interactive traffic, and the AF-and-interactive traffic on the BE traffic. The
desired behavior is also that, even on an asymmetric link like ADSL, the client and
server BE traffic fairly share the available bandwidth.
Configuration Let’s start with the components needed to configure the quality of service to meet
the requirements above.
We will need 3 labels :
A VoIP label for Voice packets.
A DSCP label for the AF packets.
An Interactive label for Interactive packets.
We will need a set of rules to assign the labels to the packets.
For voice packets we will need 2 rules, one for SIP and one for H323
For AF packets we will need only one rule.
For Interactive packets we will need a total of 14 rules. (telnet, http,smtp,
pop,ect)
We will need a set of expressions to be used in the rules.
For voice we will need a total of 8 expressions.
For AF we only need 1 expression.
For Interactive we will need a total of 14 expressions.
All other packets will be treated as Best Effort.