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Catalyst 3750 Metro Switch Command Reference
OL-9645-10
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
priority-queue
priority-queue
Use the priority-queue interface configuration command to enable the egress priority queue on a port.
Use the no form of this command to return to the default setting.
priority-queue out
no priority-queue out
Syntax Description
Defaults The egress priority queue is disabled.
Command Modes Interface configuration
Command History
Usage Guidelines When you configure the priority-queue out command, the shaped round robin (SRR) weight ratios are
affected because there is one fewer queue participating in SRR. This means that weight1 in the srr-queue
bandwidth shape or the srr-queue bandwidth share interface configuration command is ignored (not
used in the ratio calculation). Before servicing the other queues, SRR services the priority queue until it
is empty.
Follow these guidelines when the priority queue is enabled; otherwise, the egress queues are serviced
based on their SRR weights:
• If the egress priority queue is enabled, it overrides the SRR shaped and shared weights for queue 1.
• If the egress priority queue is disabled and the SRR shaped and shared weights are configured, the
shaped mode overrides the shared mode for queue 1, and SRR services this queue in shaped mode.
• If the egress priority queue is disabled and the SRR shaped weights are not configured, SRR services
the queue in shared mode.
To avoid a loss of priority traffic on an enhanced-services (ES) port when the switch is congested, you
can configure both the egress priority queueing and the strict-priority queueing (low-latency queueing
[LLQ]) features. Note that when you map certain traffic classes to the egress priority queue, they are not
automatically placed into the strict-priority queue. You must configure both the priority-queue out
interface configuration and the priority policy-map class configuration commands. For more
information, see the
“priority” section on page 2-363.
out Enable the egress priority queue.
Release Modification
12.1(14)AX2 This command was introduced.
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