Chapter 9
| Class of Service
Layer 2 Queue Settings
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the switch services each queue before moving on to the next queue. This
prevents the head-of-line blocking that can occur with strict priority queuing.
◆ If Strict and WRR mode is selected, a combination of strict and weighted service
is used as specified for each queue. The queues assigned to use strict priority
should be specified using the Strict Mode field parameter.
◆ A weight can be assigned to each of the weighted queues (and thereby to the
corresponding traffic priorities). This weight sets the frequency at which each
queue is polled for service, and subsequently affects the response time for
software applications assigned a specific priority value.
Service time is shared at the egress ports by defining scheduling weights for
WRR, or the queuing mode that uses a combination of strict and weighted
queuing. Service time is allocated to each queue by calculating a precise
number of bytes per second that will be serviced on each round.
◆ The specified queue mode applies to all interfaces.
Parameters
These parameters are displayed:
◆ Queue Mode
■
Strict – Services the egress queues in sequential order, transmitting all
traffic in the higher priority queues before servicing lower priority queues.
This ensures that the highest priority packets are always serviced first,
ahead of all other traffic.
■
WRR – Weighted Round-Robin shares bandwidth at the egress ports by
using scheduling weights, and servicing each queue in a round-robin
fashion. (This is the default setting.)
■
Strict and WRR – Uses strict or weighted service as specified for each
queue.
◆ Queue ID – The ID of the priority queue. (Range: 0-7)
◆ Strict Mode – If “Strict and WRR” mode is selected, then a combination of strict
and weighted service is used as specified for each queue. Use this parameter to
specify the queues assigned to use strict priority when using the strict-
weighted queuing mode. (Default: Disabled)
◆ Weight – Sets a weight for each queue which is used by the WRR scheduler.
(Range: 1-255; Default: Weights 1, 2, 4, 6, 8, 10, 12 and 14 are assigned to
queues 0 - 7 respectively)
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