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
• Setting a Physical Port to Ignore Tag Priority
• Setting the Priority of a MAC Address
• Displaying the Priority of a MAC Address
• Setting a Physical Port to Use DiffServ
• Setting a Physical Port to Mask DiffServ Bits
• Assigning a Priority to a DSCP
• Displaying the DiffServ Table
• Displaying the QoS Settings for a Physical Port
• Setting Up an ACL Rule
• Setting Up a Default ACL Rule
• Displaying ACL Rules