User manual

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ES-2000 Series
10 STORM CONTROL CONFIGURATION
Use the Traffic > Storm Control page to configure broadcast, multicast, and
unknown unicast storm control thresholds. Traffic 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 traffic on
your network, performance can be severely degraded or everything can
come to complete halt.
You can protect your network from traffic storms by setting a threshold for
broadcast, multicast or unknown unicast traffic. Any packets exceeding the
specified threshold will then be dropped.
COMMAND USAGE
◆ Storm Control is disabled by default.
◆ Broadcast control does not effect IP multicast traffic.
◆ When traffic exceeds the threshold specified for broadcast and
multicast or unknown unicast traffic, packets exceeding the threshold
are dropped until the rate falls back down beneath the threshold.
◆ Using both rate limiting and storm control on the same interface may
lead to unexpected results. For example, suppose broadcast storm
control is set to 500 Kbps, and
the rate limit is set to 20000 Kbps on a
Fast Ethernet port. Since 20000 Kbps is 1/5 of line speed (100 Mbps),
the received rate will actually be 100 Kbps, or 1/5 of the 500 Kbps limit
set by the storm control command. It is therefore not advisable to use
both of these commands on the same interface.
◆ The description of effective rate limiting (see Command Usage under
"Rate Limit Configuration" on page 119) also applies to storm control.
PARAMETERS
These parameters are displayed:
◆ Interface – Displays a list of ports or trunks.
◆ Type – Indicates interface type. (100Base-TX, 1000Base-T, or SFP)
◆ Unknown Unicast – Specifies storm control for unknown unicast
traffic.
◆ Multicast – Specifies storm control for multicast traffic.
◆ Broadcast – Specifies storm control for broadcast traffic.
◆ Status – Enables or disables storm control. (Default: Disabled)