Quality of Service Overview
17-8 Configuring Quality of Service
Figure 17-4 Hybrid Queuing Packet Behavior
Rate Limiting
Rate limiting is used to control the rate of traffic entering (inbound) a switch per CoS. Rate
limiting allows for the throttling of traffic flows that consume available bandwidth, in the process
providing room for other flows. Rate limiting guarantees the availability of bandwidth for other
traffic by preventing the rate limited traffic from consuming more than the assigned amount of a
network’s resources. Rate limiting accomplishes this by setting a cap on the bandwidth utilization
of specific types of inbound traffic. When a rate limit has been exceeded, the CoS can be
configured to perform one or all of the following: record a Syslog message, send an SNMP trap to
inform the administrator, and automatically disable the port.
Figure 17-5 on page 9 illustrates how bursty traffic is clipped above the assigned threshold with
rate limiting applied.
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