Configuration Using Legacy CoS SyntaxThe Cisco 12000 Series legacy Class of Service (CoS) syntax uses a cos-queue-group template to define a set of CoS definitions. You then apply the template to ToFab and FrFab queues on inbound or outbound interfaces, respectively. Step 1: Define a cos-queue-groupThe cos-queue-group command creates a named template of MDRR and WRED parameters. Available config..