Default Settings for Priority Mapping

Configuration Guide - QoS

S2720, S5700, and S6700 V200R019C10

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, ACL-based simplified traffic policy, HQoS, and SAC.

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Default Settings for Priority Mapping

Mapping from Priorities to CoS Values (PHBs) and Colors in the Inbound Direction in a DiffServ Domain

By default, the mappings in a DiffServ domain are as follows:

Table 3-1 lists the mappings from 802.1p priorities to PHBs and colors.
Table 3-2 lists the mappings from DSCP priorities to PHBs and colors.
Table 3-3 lists the mappings from EXP priorities in MPLS packets to PHBs and colors.

The mappings from interface priorities to PHBs and colors are similar to the mappings from 802.1p priorities to PHBs and colors. Colors of packets are only used to determine whether to drop packets and do not affect mappings between internal priorities and queues.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, and S6730-H support the mappings from EXP priorities to PHBs and colors.

Table 3-1 Mappings from 802.1p priorities to PHBs and colors of incoming VLAN packets in a DiffServ domain

802.1p Priority	PHB	Color
0	BE	Green
1	AF1	Green
2	AF2	Green
3	AF3	Green
4	AF4	Green
5	EF	Green
6	CS6	Green
7	CS7	Green

Table 3-2 Mappings from DSCP priorities to PHBs and colors of incoming IP packets in the DiffServ domain

DSCP	PHB	Color	DSCP	PHB	Color
0	BE	Green	32	AF4	Green
1	BE	Green	33	BE	Green
2	BE	Green	34	AF4	Green
3	BE	Green	35	BE	Green
4	BE	Green	36	AF4	Yellow
5	BE	Green	37	BE	Green
6	BE	Green	38	AF4	Red
7	BE	Green	39	BE	Green
8	AF1	Green	40	EF	Green
9	BE	Green	41	BE	Green
10	AF1	Green	42	BE	Green
11	BE	Green	43	BE	Green
12	AF1	Yellow	44	BE	Green
13	BE	Green	45	BE	Green
14	AF1	Red	46	EF	Green
15	BE	Green	47	BE	Green
16	AF2	Green	48	CS6	Green
17	BE	Green	49	BE	Green
18	AF2	Green	50	BE	Green
19	BE	Green	51	BE	green
20	AF2	Yellow	52	BE	Green
21	BE	Green	53	BE	Green
22	AF2	Red	54	BE	Green
23	BE	Green	55	BE	Green
24	AF3	Green	56	CS7	Green
25	BE	Green	57	BE	Green
26	AF3	Green	58	BE	Green
27	BE	Green	59	BE	Green
28	AF3	Yellow	60	BE	Green
29	BE	Green	61	BE	Green
30	AF3	Red	62	BE	Green
31	BE	Green	63	BE	Green

Table 3-3 Mappings from EXP priorities to PHBs and colors of incoming packets in the DiffServ domain

EXP Priority	PHB	Color
0	BE	Green
1	AF1	Green
2	AF2	Green
3	AF3	Green
4	AF4	Green
5	EF	Green
6	CS6	Green
7	CS7	Green

Mapping Between CoS Values and Interface Queue Indexes

By default, internal priorities (CoS of packets) and interface queues are mapped on a one-to-one basis. During deployment, you may need to change the mappings between CoS values and queues or map different CoS values to the same queue to avoid overburdening the device buffer. The device sends packets to different interface queues based on the internal priorities, and performs traffic shaping, congestion avoidance, and queue scheduling for the queues.

Table 3-4 lists the mappings between internal priorities and queues supported by the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, and S6730-H.

Table 3-4 Mappings between internal priorities and queues on the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-S, S5731S-H, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735S-S, S5735-S-I, S6720-EI, S6720S-EI, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S

Internal Priority	Queue Index
BE	0
AF1	1
AF2	2
AF3	3
AF4	4
EF	5
CS6	6
CS7	7

Mapping from CoS Values (PHBs) and Colors to Priorities in the Outbound Direction in the DiffServ Domain

By default, the mappings in a DiffServ domain are as follows:

Table 3-5 lists the mappings from PHBs and colors to 802.1p priorities.
Table 3-6 lists the mappings from PHBs and colors to DSCP priorities.
Table 3-7 lists the mappings from PHBs and colors to EXP priorities in MPLS packets.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, and S6730-H support the mappings from EXP priorities to PHBs and colors.

Table 3-5 Mappings from PHBs and colors to 802.1p priorities of outgoing VLAN packets in the DiffServ domain

PHB	Color	802.1p Priority
BE	Green	0
BE	Yellow	0
BE	Red	0
AF1	Green	1
AF1	Yellow	1
AF1	Red	1
AF2	Green	2
AF2	Yellow	2
AF2	Red	2
AF3	Green	3
AF3	Yellow	3
AF3	Red	3
AF4	Green	4
AF4	Yellow	4
AF4	Red	4
EF	Green	5
EF	Yellow	5
EF	Red	5
CS6	Green	6
CS6	Yellow	6
CS6	Red	6
CS7	Green	7
CS7	Yellow	7
CS7	Red	7

Table 3-6 Mappings from PHBs and colors to DSCP priorities of outgoing IP packets in the DiffServ domain

PHB	Color	DSCP
BE	Green	0
BE	Yellow	0
BE	Red	0
AF1	Green	10
AF1	Yellow	12
AF1	Red	14
AF2	Green	18
AF2	Yellow	20
AF2	Red	22
AF3	Green	26
AF3	Yellow	28
AF3	Red	30
AF4	Green	34
AF4	Yellow	36
AF4	Red	38
EF	Green	46
EF	Yellow	46
EF	Red	46
CS6	Green	48
CS6	Yellow	48
CS6	Red	48
CS7	Green	56
CS7	Yellow	56
CS7	Red	56

Table 3-7 Mappings from PHBs and colors to EXP priorities of outgoing packets in the DiffServ domain

PHB	Color	EXP Priority
BE	Green	0
BE	Yellow	0
BE	Red	0
AF1	Green	1
AF1	Yellow	1
AF1	Red	1
AF2	Green	2
AF2	Yellow	2
AF2	Red	2
AF3	Green	3
AF3	Yellow	3
AF3	Red	3
AF4	Green	4
AF4	Yellow	4
AF4	Red	4
EF	Green	5
EF	Yellow	5
EF	Red	5
CS6	Green	6
CS6	Yellow	6
CS6	Red	6
CS7	Green	7
CS7	Yellow	7
CS7	Red	7

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Updated: 2021-10-20

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Mapping from Priorities to CoS Values (PHBs) and Colors in the Inbound Direction in a DiffServ Domain

Mapping Between CoS Values and Interface Queue Indexes

Mapping from CoS Values (PHBs) and Colors to Priorities in the Outbound Direction in the DiffServ Domain

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