Cisco Systems A9014CFD Congestion Management Limitations, Precedence Prec-transmit Qos-group

Chapter 24 Configuring QoS

Configuring Quality of Service (QoS)

Table 24-3	QoS Marking Limitations by Interface
		GigabitEthernet	PPP
precedence		X
prec-transmit		X
qos-group		X	X

Congestion Management Limitations

The congestion management limitations for the Cisco ASR 901 are described in the following sections:

•Queuing Limitations

•Rate Limiting Limitations

Queuing Limitations

The Cisco ASR 901 uses Class-based fair weighted queuing (CBFQ) for congestion management. Table 24-4summarizes the queuing commands that you can apply when using CBFQ according to interface type.

Table 24-4	QoS Queuing Limitations by Interface
		GigabitEthernet		PPP
Value		Ingress	Egress	Ingress	Egress
bandwidth (kbps)
bandwidth percent			X		X
bandwidth remaining percent			X		X
compression header ip
drop
fair-queue
priority			X		X
priority (kbps)
priority (without queue-limit)
priority percent			X		X
queue-limit (cells)
queue-limit (packets)					X
random-detect discard-class-based			X

Rate Limiting Limitations

You can use rate limiting for congestion management on the Cisco ASR 901. Table 24-5summarizes the rate limiting parameters that you can use with the police command according to interface type. The table uses the following terms:

•Rate—A speed of network traffic such as a committed information rate (CIR) or peak information rate (PIR).

•Actions—A defined action when traffic exceeds a rate, such as conform-action, exceed-action, or violate-action.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		24-29