Cisco Systems A9014CFD manual Classification Comparisons, Per-hop Decimal Precedence CoS, 24-10

Chapter 24 Configuring QoS

Understanding QoS

This display shows the available classification options:

Router(config-cmap)# match ip dscp		?
<0-63>	Differentiated services	codepoint value
af11	Match packets with AF11	dscp (001010)
af12	Match packets with AF12	dscp (001100)
af13	Match packets with AF13	dscp (001110)
af21	Match packets with AF21	dscp (010010)
af22	Match packets with AF22	dscp (010100)
af23	Match packets with AF23	dscp (010110)
af31	Match packets with AF31	dscp (011010)
af32	Match packets with AF32	dscp (011100)
af33	Match packets with AF33	dscp (011110)
af41	Match packets with AF41	dscp (100010)
af42	Match packets with AF42	dscp (100100)
af43	Match packets with AF43	dscp (100110)

cs1	Match packets with CS1(precedence 1) dscp (001000)
cs2	Match packets with CS2(precedence 2) dscp (010000)
cs3	Match packets with CS3(precedence 3) dscp (011000)
cs4	Match packets with CS4(precedence 4) dscp (100000)
cs5	Match packets with CS5(precedence 5)	dscp (101000)
cs6	Match packets with CS6(precedence 6)	dscp (110000)
cs7	Match packets with CS7(precedence 7)	dscp (111000)
default	Match packets with default dscp (000000)
ef	Match packets with EF dscp (101110)

Note For more information on DSCP prioritization, see RFC-2597 (AF per-hop behavior), RFC-2598 (EF), or RFC-2475 (DSCP).

Classification Comparisons

Table 24-1shows suggested IP DSCP, IP precedence, and CoS values for typical traffic types.

Table 24-1			Typical Traffic Classifications
				DSCP	DSCP	IP
	Traffic Type			per-hop	(decimal)	Precedence	CoS
	Voice-bearer—traffic in a priority queue or the queue with the			EF	46	5	5
	highest service weight and lowest drop priority.
	Voice control—signalling traffic, related to call setup, from a			AF31	26	3	3
	voice gateway or a voice application server.
	Video conferencing—in most networks, video conferencing			AF41	34	4	4
	over IP has similar loss, delay, and delay variation requirements
	as voice over IP traffic.
	Streaming video—relatively high bandwidth applications with a			AF13	14	1	1
	high tolerance for loss, delay, and delay variation. Usually
	considered more important than regular background
	applications such as e-mail and web browsing.
	Mission critical date (gold data)—delay-sensitive applications
	critical to the operation of an enterprise.
	•	Level 1		AF21	18	2	2
	•	Level 2		AF22	20	2	2
				AF23	22	2	2
	•	Level 3
			Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
	24-10						OL-23826-09