You can use DiffServ when end-to-end QoS is desired.. Modern routers can map DiffServ Code Points (DSCP) to 802.1p priority values, so 802.1p tags can be recreated on each Ethernet link.
IEEE 802.1p states a standard according to which these bits are used for CoS. The precedence is listed in IEEE 802.1 precedence and service mapping.
Table 1: IEEE 802.1 precedence and service mapping
User priority |
Service mapping |
000 |
Default, assumed to be best effort |
001 |
Reserved, less than best effort |
010 |
Reserved |
011 |
Reserved |
100 |
Delay sensitive, no bound |
101 |
Delay sensitive, 100 ms bound |
110 |
Delay sensitive, 10 ms bound |
111 |
Network control |
