2.4 Differentiated Services (contd.)..


The functionalityof Diff-Serv in an Autonomous system and that in a inter-domain operation is depicted below.
 

                                      Figure 3: Basic Diff-Serv Framework
 
 

 

                                 Figure 4: Inter-Domain Diff-Serv operation
 
The above figure also shows the Gateway Routers (GR) which is the 'edge' routers for the Domain1 and domain2
To summarize, classifiers and traffic conditioners are used to select which packets are to be added to behaviour aggregates i.e the PHB of the aggregate flow. These aggregates receive differentiated treatment in a DS domain traffic conditioners alter the temporal (for the appointed time) characteristics of the aggregate flows to conform to some requirements.