Catégorisation du trafic faite grâce à des descripteurs:
	Ingress interface
	CoS Value on ISL or 802.1p frame
	Source or Destination IP Address
	IP precedence or DSCP value on the IP Packet header
	MPLS EXP value on the MPLS header
	Application type
Layer 2 QoS
Ethernet (802.1=q/p)
	
	Class of Service (CoS)
	On 802.1P frame
	3-bit priority (PRI) field 
	000 – Routine – Best-effort
	001 – Priority – Medium priority
	010 – Immediate – High priority
	011 
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