Chapter 22: Port Priority And Rate Limiting Configuration; Port Priority Configuration Summary - Enterasys Matrix DFE-Gold Series Configuration Manual

Port Priority and Rate Limiting Configuration
This chapter describes the Port Priority and Rate Limiting set of commands and how to use them.
For information about...

Port Priority Configuration Summary

Configuring Port Priority
Configuring Priority to Transmit Queue Mapping
Configuring Port Traffic Rate Limiting
Port Priority Configuration Summary
The Enterasys Matrix Series 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, depending on port type, up to 16 transmit
queues (0‐15) 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 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.
In addition, the device's rate limiting capabilities allow you to further prioritize traffic by limiting
the rate of inbound or outbound traffic on a per port/priority basis.
Enterasys Networks' enhanced CoS implementation allows you to use the following methods to
configure Class of Service on the Enterasys Matrix Series device:
• Configuring transmit queueing and rate limiting on a per‐port basis as described in this
chapter.
• Allowing the device to assign policy‐based inbound rate limiters and transmit queues as
described in Chapter 8.
Note: When CoS override is enabled using the set policy profile command as described in
policy profile" on page 8-3, CoS-based classification rules will take precedence over priority settings
configured with the set port priority command described in this section.
Enterasys Matrix DFE-Gold Series Configuration Guide 22-1
22
Refer to page...
22-1
22-2
22-5
22-9
"set