Cisco Systems A9014CFD manual Propagation Limitations, Classification Limitations, GigabitEthernet

Chapter 24 Configuring QoS

Configuring Quality of Service (QoS)

•2R3C policer provides exceed and violate counters as a single counter.

Propagation Limitations

The Cisco ASR 901 has the following limitations when propagating QoS values between interfaces:

•The following limitations apply when traffic ingresses through a GigabitEthernet interface and egresses through a GigabitEthernet interface:

–When traffic is switched at layer 2, the QoS group is propagated through the router.

•The following limitations apply when traffic ingresses through any other interface type (host-generated, PPP) and egresses through the GigabitEthernet interface.

–The Precedence bit value is propagated to the CoS bit (for host-generated interface only).

–The CoS bit value is mapped 1:1 to the QoS group value.

See Sample QoS Configuration, page 24-33for a sample QoS configuration that accounts for propagation limitations on the Cisco ASR 901.

Classification Limitations

Table 24-2summarizes the values that you can use to classify traffic based on interface type. The values are parameters that you can use with the match command.

	Table 24-2	QoS Classification Limitations by Interface
			GigabitEthernet		PPP
	Value		Ingress	Egress	Ingress	Egress
	access-group
	all		X	X
	any		X	X	X	X
	class-map
	cos		X	X
	destination-address
	discard-class
	dscp		X	X	X	X
	flow pdp
	frde
	frdlci
	ip dscp		X	X	X	X
	ip precedence		X	X
	ip rtp
	mpls experimental		X
	not
	packet length
	precedence		X	X
			Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09							24-27