Document No. 10-300077, Issue 2 25-7
80-Series QoS
Classification of Traffic
The switch assigns traffic to one of eight queues accordi ng to the priorit y, or
“class,” of the traffic. Priorities ran ge 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 Characteris tic s
■Classifying Traffic by Layer 3 or Layer 4 Characteristics
■Diffserv
■Precedence of Priorities
■Supported Number of Queues
■Setting the Priority of a Physical Port