Cos-Queue Strict - Dell N1100-ON Reference Manual

cos-queue strict

Use the cos-queue strict command in either Global Configuration mode or
Interface Configuration mode to activate the strict priority scheduler mode
for the specified queue. To restore the default weighted scheduler mode for
each specified queue, use the no form of this command.
Syntax
cos-queue strict {queue-id-1} [{queue-id-2} ... {queue-id-n}]
no cos-queue strict {queue-id-1} [{queue-id-2} ... {queue-id-n}]
• queue-id-1 — Specifies the queue ID for which you are activating the
strict priority scheduler. You can specify a queue ID for as many queues as
you have (queue-id 1 through queue-id-n). (Range: 0–6)
Default Configuration
This command has no default configuration.
Command Mode
Global Configuration mode or Interface Configuration (gigabitethernet,
port-channel, tengigabitethernet, fortygigabitethernet) mode
User Guidelines
Strict priority (SP) queues are scheduled in priority order ahead of WRR
queues. Strict priority queues are allocated unlimited bandwidth by default.
Configuring the min-bandwidth on a CoS queue also configured for strict
priority wastes the scheduler slots. Use the cos-queue min-bandwidth
command on lower priority SP and WRR queues to ensure fairness to lower
priority queues by reserving a specific amount of scheduler bandwidth. Use
the show interfaces cos-queue command to display the class of service
settings.
Strict priority scheduling is most useful when it is desirable that low-bit-rate
time-sensitive traffic be queued ahead of other traffic. The administrator
must be careful to limit the bandwidth assigned to the strict priority queue to
avoid potential denial of service attacks. See the "Enterprise Voice VLAN
Configuration With QoS" section in the Users Configuration Guide for a rate
limiting example. If using the min-bandwidth command to reserve
Layer 2 Switching Commands
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