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Document No. 10-300077, Issue 2 25-9
80-Series QoS
Classifying Traffic by Layer 2 Characteristics
In addition to Cisco ISL tag, 802.1p tag, and physical port priority, the
switch can classify traffic by:
■ Source MAC address
■ Destination MAC address
For information about how to set a priority for a source or destination MAC
address, see “Setting the Priority of a MAC Address” later in this chapter.
In addition to these layer 2 characteristics, you can classify bridged IP
traffic by DiffServ code point. For more information on classifying bridged
IP traffic by DiffServ code point, see “Diffserv” later in this chapter.
Classifying Traffic by Layer 3 or Layer 4 Characteristics
ACL Rules You can, alternately, configure the switch to classify traffic by the IP
characteristics of packets, instead of 802.1p tag priority, physical port
priority, or other layer 2 characteristics.
To assign priorities to packets by their IP characteristics, you create a rule in
an access control list (ACL). The rule can:
■ Set an ACL rule priority
■ Use the DiffServ code point
■ Mask the three least significant bits of the DSCP. The switch
recognizes the remaining bits as the IP precedence field.
■ Replace the existing DSCP with a DSCP that you specify
■ Use the layer 2 priority
You can specify the TCP/IP traffic that you want the rule to apply to. The
rule can apply to traffic with a specific:
■ IP destination address
■ IP source address
■ IP Protocol
■ Destination TCP or UDP port
■ Source TCP or UDP port