Precedence of Priorities
If multiple priorities are associated with a frame or packet, the switch classifies the frame or packet according to the priority of highest precedence. See Table�181 for the precedence of each priority.
The switch then assigns the frame or packet to the appropriate priority queue based on the priority of the frames.
Table�181:�Precedence of Priorities �
| Layer |
Precedence of Priority |
Priority Used for Classification |
| Layer 3 |
|
|
High |
ACL rule priority |
|
|
|
DSCP in the packet or DSCP that the switch replaces the original DSCP with |
| Layer 2 |
|
|
|
DSCP (for bridged IP traffic) |
|
|
|
Destination MAC address priority |
|
|
|
Source MAC address priority |
|
|
|
802.1p tag |
|
|
|
Cisco ISL tag |
|
|
Low |
Physical port priority |
|
