LevelOne FGL-2870 - Manual (Page 226)

Configuring the Switch
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3
Setting Broadcast Storm Thresholds
Broadcast storms may occur when a device on your network is malfunctioning, or if
application programs are not well designed or properly configured. If there is too
much broadcast traffic on your network, performance can be severely degraded or
everything can come to complete halt.
You can protect your network from broadcast storms by setting a threshold for
broadcast traffic. Any broadcast packets exceeding the specified threshold will then
be dropped.
Command Usage
• Broadcast Storm Control is enabled by default.
• Broadcast control does not effect IP multicast traffic.
• Due to an ASIC chip limitation, the supported storm control modes include:
- broadcast
- broadcast + multicast
- broadcast + multicast + unknown unicast
This means that when mulicast storm control is enabled, broadcast storm control
is also enabled (using the threshold value set by the multicast storm control
command). And when unknown unicast storm control is enabled, both broadcast
and multicast storm control are also enabled (using the threshold value set by the
unknown unicast storm control command).
• The storm control feature provided on this configuration page is a hardware level
control function. Traffic storms can also be controlled at the software level using
automatic storm control which triggers various control responses. This control type
is only supported by the Command Line Interface as described under "Automatic
Traffic Control Commands" on page 4-233. However, note that only one of these
control types can be applied to a port. Enabling hardware-level storm control on a
port will disable automatic storm control on that port.
Command Attributes
• Port – Port number.
• Type – Indicates the port type. (100BASE-TX, 1000BASE-T, or SFP)
• Protect Status – Enables or disables broadcast storm control. (Default: Enabled)
• Threshold – Threshold level as a rate; i.e., kilobits per second.
(Range: 64-100000 kilobits per second for Fast Ethernet ports; 64-1000000 kilobits
per second for Gigabit ports; Default: 64 kilobits per second)
• Trunk – Shows if a port is a trunk member.