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9 CONGESTION CONTROL
The switch can set the maximum upload or download data transfer rate for
any port. It can control traffic storms by setting a maximum threshold for
broadcast traffic or multicast traffic. It can also set bounding thresholds for
broadcast and multicast storms which can be used to automatically trigger
rate limits or to shut down a port.
Congestion Control includes following options:
◆ Rate Limiting – Sets the input and output rate limits for a port.
◆ Storm Control – Sets the traffic storm threshold for each interface.
◆ Automatic Traffic Control – Sets thresholds for broadcast and multicast
storms which can be used to trigger configured rate limits or to shut
down a port.
RATE LIMITING
Use the Traffic > Congestion Control > Rate Limit page to apply rate
limiting to ingress or egress ports. This function allows the network
manager to control the maximum rate for traffic received or transmitted on
an interface. Rate limiting is configured on interfaces at the edge of a
network to limit traffic into or out of the network. Packets that exceed the
acceptable amount of traffic are dropped.
Rate limiting can be applied to individual ports. 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.
CLI REFERENCES
â—† "Rate Limit Commands" on page 771
COMMAND USAGE
â—† The ASIC used to control the ingress rate limit has a default time frame
of 10 ms, 100 ms, and 1 second respectively for 1 Gbps, 100 Mbps,
and 10 Mbps connection rates. Ingress rate limiting is processed 100
times per second (also referred to as 100 scales per second),
regardless of the packet size.
N
OTE
:
Egress rate limiting does not function in this manner.
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