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Document No. 10-300077, Issue 2 25-7
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)
This section contains the following information and procedures:
■ Default Priority
■ Classifying Traffic by Layer 2 Characteristics
■ Classifying Traffic by Layer 3 or Layer 4 Characteristics
■ Diffserv
■ Precedence of Priorities
■ Supported Number of Queues
■ Setting the Priority of a Physical Port