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Quality of Service Overview
Figure 4
Rate Limiting
Rate limiting is used to control the rate of traffic entering (inbound) and/or leaving (outbound) 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 both inbound and outbound 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
applied.
February 22, 2008
Hybrid Queuing Packet Behavior
5 illustrates how bursty traffic is clipped above the assigned threshold with rate limiting
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