Chapter 9: Port Parameters
182
Configuring Threshold Limits for Ingress Packets
You can set threshold limits for the ingress packets on the ports. The
threshold limits control the number of packets the ports accept each
second. Packets that exceed the limits are discarded by the ports. You
can set different limits for broadcast, multicast, and unknown unicast
traffic. This feature is useful in preventing bottlenecks from forming in a
network.
To assign a threshold limit on a port, use the STORM-CONTROL
command in the Port Interface mode. The format is:
storm-control broadcast|multicast|dlf level
value
The BROADCAST, MULTICAST and DLF parameters specify the packet
type of the threshold limit. (The DLF parameter, the acronym for “database
lookup failure,” is for unknown unicast packets.) The VALUE parameter
specifies the maximum permitted number of ingress packets per second a
port will accept. The range is 0 to 33,554,431 packets.
This example sets a threshold of 5,000 packets per second for ingress
broadcast packets on port 12:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.12
awplus(config-if)# storm-control broadcast level 5000
This example sets a threshold of 100,000 packets per second for ingress
multicast packets on port 4:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.4
awplus(config-if)# storm-control multicast level 100000
This example sets a threshold of 200,000 packets per second for ingress
unknown unicast packets on ports 15 and 17:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.15,port1.0.17
awplus(config-if)# storm-control dlf level 200000
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