Chapter 8
| Congestion Control
Storm Control
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â—† 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.
â—† Traffic storms can be controlled at the hardware level using Storm Control or at
the software level using Automatic Traffic Control which triggers various
control responses. However, 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.
â—† Rate limits set by this function are also used by automatic storm control when
the control response is set to rate control on the Auto Traffic Control (Configure
Interface) page.
â—† Using both rate limiting and storm control on the same interface may lead to
unexpected results. It is therefore not advisable to use both of these features on
the same interface.
Parameters
These parameters are displayed:
◆ Interface – Displays a list of ports or trunks.
◆ Type – Indicates the port type. (1000BASE-T, 10GBASE SFP+, or 1000BASE SFP
(used in the ECS4620-28F/28F-DC or when this transceiver type is used in an
SFP+ port).
◆ 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: Enabled for broadcast
storm control, disabled for multicast and unknown unicast storm control)
◆ Rate – Threshold level in packets per second.
(Range: 500-14881000 pps; Default: Disabled for unknown unicast and
multicast traffic, 500 pps for broadcast traffic)
Web Interface
To configure broadcast storm control:
1. Click Traffic, Storm Control.
2. Set the interface type to Port or Trunk.
3. Set the Status field to enable or disable storm control.
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