Enterasys 1G58x-09, Руководство по настройке

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Matrix E1 Series (1G58x-09 and 1H582-xx) Configuration Guide 9-1
9
Port Priority and Classification Configuration
This chapter describes the Port Priority, Priority Classification, and Rate Limiting set of commands
and how to use them.
9.1 PORT PRIORITY AND CLASSIFICATION CONFIGURATION
SUMMARY
9.1.1 Priority
This 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 four transmit queues (0-3) of traffic 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 5, the frames received
through that port without a priority indicated in their tag header are classified as a priority 5 and
transmitted according to that priority.
Important Notice
In addition to the commands described in this section, Matrix E1 (1G58x-09 and 1H582-xx)
devices with firmware versions 2.05.xx and higher also support policy profile-based classification
to a Class of Service or VLAN. Policy classification commands that can be used alternatively to
priority classification commands are noted in the appropriate sections under the heading
“Command Alternative (v2.05.xx and higher)”. For a description of the complete policy
classification command set, refer to
Chapter 8.