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Application Scenarios for Priority Mapping
Networking Requirements
As shown in Figure 4-3, the network provides voice, video, and data services, with priorities in descending order. When different service flows arrive at the ISP network, devices on the ISP network must identify priorities of the services to provide differentiated services.
A switch can identify packets based on priority fields, such as 802.1p or DSCP. When packets arrive at the switch, the switch maps packet priorities to local priorities and drop priorities, and provides different QoS services based on the local priorities and drop priorities.
Service Deployment
- On SwitchA, configure a traffic policy in the inbound direction to re-mark voice, video, and data packets with different DSCP priorities. The priorities of voice, video, and data services are in descending order.
- Configure SwitchB to map DSCP priorities of incoming packets to 802.1p priorities and drop priorities. SwitchB then provides differentiated services based on local priorities mapped to the 802.1p priorities and drop priorities.