Enterasys Networks 9034313-07 manual Port Priority Configuration Summary

12

Port Priority Configuration

This chapter describes the Port Priority set of commands and how to use them. Refer to the “Configuring QoS” Feature Guide for detailed information about configuring quality of service on the SecureStack C3. The Enterasys Networks firmware Feature Guides are available at:

http://www.enterasys.com/support/manuals

For information about...	Refer to page...
Port Priority Configuration Summary	12-1
Configuring Port Priority	12-2
Configuring Priority to Transmit Queue Mapping	12-4
Configuring Quality of Service (QoS)	12-7

Port Priority Configuration Summary

The SecureStack C3 device supports Class of Service (CoS), which allows you to assign mission‐ critical data to higher priority through the device by delaying less critical traffic during periods of congestion. The higher priority traffic through the device is serviced first before lower priority traffic. The Class of Service capability of the device is implemented by a priority queueing mechanism. Class of Service is based on the IEEE 802.1D (802.1p) standard specification, and allows you to define eight priorities (0 through 7) and assign them to transmit queues for each port.

A priority 0 through 7 can be set on each port, with 0 being the lowest priority. A port receiving a frame without priority information in its tag header is assigned a priority according to the default priority setting on the port. For example, if the priority of a port is set to 4, the frames received through that port without a priority indicated in their tag header are classified as a priority 4 and transmitted according to that priority.

Note: When CoS override is enabled using the set policy profile command as described in “set policy profile” on page 11-4,CoS-based classification rules will take precedence over priority settings configured with the set port priority command described in this section.

SecureStack C3 Configuration Guide 12-1