Avaya P580 User Manual download pdf (Page 653)

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Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 -7

80-Series QoS

Classification of Traffic

The switch assigns traffic to one of eight queues according to the

priority, or “class,” of the traffic. Priorities range 0 to 7, 7 being the

highest priority. You can set the switch to classify traffic by the

priority assigned to the following characteristics:

■ Layer 2 characteristics:

— Physical port that the frame or packet is received on

— Cisco ISL tag or 802.1p tag

— Source MAC address

— Destination MAC address

■ Layer 3 characteristics:

— DSCP in the packet

— New DSCP that replaces the original DSCP. You specify

this new DSCP.

— IP protocol (assigned by means of an ACL rule)

— Destination IP address (assigned by means of an ACL

rule)

— Source IP address (assigned by means of an ACL rule)

■ Layer 4 characteristics:

— Destination TCP or UDP port (assigned by means of an

ACL rule)

— Source TCP or UDP port (assigned by means of an ACL

rule)

Default Priority

By default, the switch uses the priority from the 802.1p tag field, if

present, to classify a frame.

If you do not change any of the QoS default settings and the frame

does not have an 802.1 tag or Cisco ISL tag, the switch assigns the

priority of the physical port to the packet. Each physical port has a

default priority of 3. For information on how to change the priority

for a physical port, see “Setting the Priority of a Physical Port” on

page 13.

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