Cisco Systems 3560 사용자 설명서

For more information, see the 

, the 

Both the ingress and egress queues are serviced by SRR, which controls the rate at which packets are 
sent. On the ingress queues, SRR sends packets to the internal ring. On the egress queues, SRR sends 
packets to the egress port. 

You can configure SRR on egress queues for sharing or for shaping. However, for ingress queues, 
sharing is the default mode, and it is the only mode supported.

In shaped mode, the egress queues are guaranteed a percentage of the bandwidth, and they are 
rate-limited to that amount. Shaped traffic does not use more than the allocated bandwidth even if the 
link is idle. Shaping provides a more even flow of traffic over time and reduces the peaks and valleys of 
bursty traffic. With shaping, the absolute value of each weight is used to compute the bandwidth 
available for the queues.

In shared mode, the queues share the bandwidth among them according to the configured weights. The 
bandwidth is guaranteed at this level but not limited to it. For example, if a queue is empty and no longer 
requires a share of the link, the remaining queues can expand into the unused bandwidth and share it 
among them. With sharing, the ratio of the weights controls the frequency of dequeuing; the absolute 
values are meaningless. Shaping and sharing is configured per interface. Each interface can be uniquely 
configured.

For more information, see the 

, and the 

.

CoS 6-7

100%

60%

40%

1000

600

400

0

CoS 4-5

CoS 0-3

86692