9.2.2 Edge and core routers

The DiffServ edge and core routers are defined in class edgeQueue and class coreQueue, which are derived from class dsREDQueue, see dsEdge, dsCore.{h,cc}.

Packet marking is implemented in class edgeQueue. A packet is marked with a code point according to the policy specified before it is put into the corresponding physical and virtual queue. Class edgeQueue has a reference to an instance of class PolicyClassifier, which contains policies for packet marking.