The ip-dscp-outbound command converts the CoSs and colors of downstream IP packets in the current domain into corresponding DSCP values.
The undo ip-dscp-outbound command restores the default settings.
By default, the mappings from CoSs and colors to DSCP values of downstream IP packets in the DS domain are shown in Table 1 in Usage Scenario.
| Parameter | Description | Value |
|---|---|---|
| service-class |
Specifies the CoS of downstream packets. |
The value is an enumerated type and can be case-insensitive EF, AF1, AF2, AF3, AF4, BE, CS6, or CS7. |
| color |
Specifies the color of packets. |
The value is an enumerated type and can be case-insensitive green, yellow, or red. |
| map dscp-value |
Specifies the DSCP value. |
The value is an integer ranging from 0 to 63. |
Usage Scenario
When a device functions as the gateway of different networks, the precedence, such as the 802.1p, DSCP, and EXP values, in the packets that access the device are all mapped to the internal precedence of the device that is presented through the CoSs and colors. When the device sends out the packet, the internal precedence is mapped back to the external precedence.
Simple traffic classification is usually implemented on the core devices of the network. You can run this command to set the mappings from CoSs and colors to DSCP values on the outbound interface.The service-color mappings for DSCP values take effect for both IPv4 and IPv6.
Mappings from CoSs and colors to DSCP values of downstream IP packets in the DS domain
| Service | Color | DSCP |
|---|---|---|
| BE | green | 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 |
| CS6 | green | 48 |
| CS7 | green | 56 |
Prerequisites
The DS domain is created in the system view.
Implementation Procedure
After this command is configured in the DS domain and the DS domain is bound to the outbound interface, packets are marked with different IP precedence that is mapped to the CoSs and colors in the mappings in the DS domain. Then, packets with different IP precedence enter different queues for scheduling.
Configuration Impact
Packets are marked with different IP precedence values on the outbound interface according to the mappings in the DS domain.
The downstream IP packets are mapped to DSCP values based on the green color uniformly.Precautions
If you do not specify service-class color, the undo ip-dscp-outbound command restores all the mappings to the default.
In VS mode, this command is supported only by the admin VS.