Installation manual

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Class of Service Commands
The commands described in this section allow you to specify which data packets have
greater precedence when traffic is buffered in the switch due to congestion. This switch
supports CoS with four priority queues for each port. Data packets in a port’s high-priority
queue will be transmitted before those in the lower-priority queues. You can set the
default priority for each interface, the relative weight of each queue, and the mapping of
frame priority tags to the switch’s priority queues.
Priority Commands (Layer 2)
queue mode
This command sets the queue mode to strict priority or Weighted Round-Robin (WRR) for
the class of service (CoS) priority queues. Use the no form to restore the default value.
Syntax
queue mode {strict | wrr}
no queue mode
• strict - Services the egress queues in sequential order, transmitting all traffic in
the higher priority queues before servicing lower priority queues.
• wrr - Weighted Round-Robin shares bandwidth at the egress ports by using
scheduling weights 1, 2, 4, 8 for queues 0 - 3 respectively.
Table 4-76 Priority Commands
Command Groups Function Page
Priority (Layer 2) Configures default priority for untagged frames, sets queue weights,
and maps class of service tags to hardware queues
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Priority (Layer 3 and 4) Maps IP DSCP tags to class of service values 4-301
Table 4-77 Priority Commands (Layer 2)
Command Function Mode Page
queue mode Sets the queue mode to strict priority or Weighted
Round-Robin (WRR)
GC 4-296
switchport priority default Sets a port priority for incoming untagged frames IC 4-297
queue cos-map Assigns class-of-service values to the priority queues IC 4-298
show queue mode Shows the current queue mode PE 4-299
show queue bandwidth Shows round-robin weights assigned to the priority queues PE 4-299
show queue cos-map Shows the class-of-service map PE 4-300
show interfaces switchport Displays the administrative and operational status of an
interface
PE 4-197