Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure Quality of Service for Outbound Traffic

Values in these two columns define the QoS classifiers to use for identifying packets to prioritize.

Indicates 802.1p priority assignments are in use for packets with 23 or 80 as a TCP or UDP Application port number.

Shows the 802.1p priority assignment for packets with the indicated QoS classifiers.

Figure 15-3. Example of Configuring and Listing 802.1p Priority Assignments on TCP/UDP Ports

Assigning a DSCP Policy Based on TCP or UDP Port Number

This option assigns a previously configured DSCP policy (codepoint and 802.1p priority) to outbound TCP or UDP packets having the specified port number. That is, the switch:

1.Selects an incoming IP packet if the TCP or UDP port number it carries matches the port number specified in the TCP or UDP classifier (as shown in figure 15-3,above).

2.Overwrites the packet’s DSCP with the DSCP configured in the switch for such packets.

3.Assigns the 802.1p priority configured in the switch for the new DSCP. (Refer to “Differentiated Services Codepoint (DSCP) Mapping” on page 15-51.)

4.Forwards the packet through the appropriate outbound port queue.

For more on DSCP, refer to “Terminology” on page 15-5.

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