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3
Configuring the Switch
Configuring Rate Limits
This function allows the network manager to control the maximum rate for traffic
transmitted or received on a port. Rate limiting is configured on ports at the edge of
a network to limit traffic coming into or out of the network. Traffic that falls within the
rate limit is transmitted, while packets that exceed the acceptable amount of traffic
are dropped.
Rate limiting can be applied to individual ports or trunks. When an interface is
configured with this feature, the traffic rate will be monitored by the hardware to
verify conformity. Non-conforming traffic is dropped, conforming traffic is forwarded
without any changes.
Rate Limit Granularity
Rate limit granularity is an additional feature enabling the network manager greater
control over traffic on the network. The "rate limit granularity" is multiplied by the
"rate limit level" (page 3-81) to set the actual rate limit for an interface. Granularity is
a global setting that applies to Fast Ethernet or Gigabit Ethernet interfaces.
Command Usage
• For Fast Ethernet interfaces, the rate limit granularity is 512 Kbps, 1 Mbps, or
3.3 Mbps
• For Gigabit Ethernet interfaces, the rate limit granularity is 33.3 Mbps.
Web – Click Port, Rate Limit, Granularity. Select the required rate limit granularity for
Fast Ethernet and Gigabit Ethernet, and click apply.
Figure 3-49. Rate Limit Granularity Configuration
CLI - This example sets and displays Fast Ethernet and Gigabit Ethernet granularity.
Console(config)#rate-limit fastethernet granularity 512
Console(config)#rate-limit gigabitethernet granularity 33300
console#show rate-limit
Fast ethernet granularity:
Gigabit ethernet granularity:
Console#
3-80
512
33300
4-118
4-118
4-118
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