Queue Bandwidth; Queue Cos-Map - SMC Networks TigerStack II SMC8926EM Management Manual

35
Class of Service Commands

queue bandwidth

This command assigns weighted round-robin (WRR) weights to the eight class of
service (CoS) priority queues. Use the no form to restore the default weights.
Syntax
queue bandwidth weight0...weight7
no queue bandwidth
weight0...weight7 - The ratio of weights for queues 0 - 7 determines the
weights used by the WRR scheduler. (Range: 1 - 15)
Default Setting
Weights 1, 2, 4, 6, 8, 10, 12, 14 are assigned to queues 0 - 7 respectively.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• WRR controls bandwidth sharing at the egress port by defining scheduling
weights.
• Bandwidth is allocated to each queue by calculating a precise number of bytes
per second that will be serviced on each round. The granularity used to
calculate this number is based on a unit of 2k bytes. The bytes serviced per
second per queue in each round is (queue weight*granularity).
Example
This example shows how to assign WRR weights to each of the priority queues:
Console#configure
Console(config)#int eth 1/5
Console(config-if)#queue bandwidth 1 3 5 7 9 11 13 15
Console(config-if)#
Related Commands
show queue bandwidth (35-6)

queue cos-map

This command assigns class of service (CoS) values to the priority queues (i.e.,
hardware output queues 0 - 7). Use the no form set the CoS map to the default
values.
Syntax
queue cos-map queue_id [cos1 ... cosn]
no queue cos-map
• queue_id - The ID of the priority queue.
Ranges are 0 to 7, where 7 is the highest priority queue.
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