Avaya P580 - Manual (Page 657)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 -11
80-Series QoS
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 6-138 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 6-138. 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