ip-dscp-inbound

Function

The ip-dscp-inbound command maps the DSCP priority of incoming IP packets in a DiffServ domain to the PHB and colors the packets.

The undo ip-dscp-inbound command restores the default mapping.

Table 1 lists the default mappings from the DSCP priorities to PHBs and colors of incoming IP packets in a DiffServ domain.

**Table 1** 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

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, S5735S-S, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-S, S5731S-H, S5732-H, S6720-EI, S6720S-EI, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S:

ip-dscp-inbound dscp-value phb service-class [ green | yellow | red ]

undo ip-dscp-inbound [ dscp-value ]

S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S:

ip-dscp-inbound dscp-value phb service-class

undo ip-dscp-inbound [ dscp-value ]

Parameters

Parameter	Description	Value
dscp-value	Specifies the DSCP priority of IP packets.	The value is an integer that ranges from 0 to 63.
phb service-class	Specifies a PHB.	The value can be BE, AF1 to AF4, EF, CS6, or CS7, each of which corresponds to queues 0 to 7 respectively.
green	Indicates that packets are colored green.	-
yellow	Indicates that packets are colored yellow.	-
red	Indicates that packets are colored red.	-

Views

DiffServ domain view

Default Level

2: Configuration level

Usage Guidelines

Scenario

To implement QoS scheduling for incoming IP packets carrying DSCP priorities, use the ip-dscp-inbound command to configure mappings from DSCP priorities of packets to PHBs and color the packets. After a DiffServ domain is bound to the inbound interface of packets, the device forwards the packets to queues based on PHBs of the packets. Congestion management is implemented. Packets are scheduled according to their colors after a discard template is configured, avoiding congestion.

Precautions

The color is used to determine whether packets are discarded during flow control, and is independent of the mapping from internal priorities to queues.
The CoS values of packets are mapped to the corresponding internal priorities and the packets are colored accordingly. If no mapping from DSCP priorities to CoS values is specified, the device uses the default mappings of the system.
If you do not specify the parameter dscp-value when running the undo ip-dscp-inbound command, all mappings from DSCP priorities to CoS values is restored.
The DiffServ domain default exists by default. On the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S, only the DiffServ domain default is supported.

Example

# For devices excluding the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S: In DiffServ domain ds1, map DSCP priority 8 of the incoming IP packets to PHB AF1 and mark the packets yellow.

<HUAWEI> system-view
[HUAWEI] diffserv domain ds1
[HUAWEI-dsdomain-ds1] ip-dscp-inbound 8 phb af1 yellow

# For the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S: In the DiffServ domain, map DSCP priority 8 of the incoming IP packets to PHB AF1.

<HUAWEI> system-view
[HUAWEI] diffserv domain default
[HUAWEI-dsdomain-default] ip-dscp-inbound 8 phb af1