LevelOne FGL-2870 - Manual (Page 228)

Configuring the Switch
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3
Setting Multicast Storm Thresholds
You can protect your network from excess multicast traffic by setting thresholds for
each port. Any multicast packets exceeding the specified threshold will then be
dropped.
Command Usage
• Multicast Storm Control is disabled by default.
• 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. (Range: 1-28/52)
• Type – Indicates the port type. (100BASE-TX, 1000BASE-T, or SFP)
• Protect Status – Enables or disables multicast storm control. (Default: Disabled)
• Threshold – Threshold as percentage of port bandwidth. (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 port is a trunk member.