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This chapter describes the Port Priority 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 Quality of Service (QoS)
Port Priority Configuration Summary
The SecureStack B3 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.
Configuring Port Priority
Purpose
To view or configure port priority characteristics as follows:
•
Display or change the port default Class‐of Service (CoS) transmit priority (0 through 7) of
each port for frames that are received (ingress) without priority information in their tag
header.
•
Display the current traffic class mapping‐to‐priority of each port.
Note: When CoS override is enabled using the set policy profile command as described in
policy
profile" on page 10-3, CoS-based classification rules will take precedence over priority
settings configured with the set port priority command described in this section.
Port Priority Configuration
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SecureStack B3 Configuration Guide 11-1
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