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port. Enabling hardware-level storm control on a port will disable automatic
storm control on that port.
◆
The 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.
◆
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
5000 Kbps, and the rate limit is set to 100000 Kbps on a Gigabit Ethernet port.
Since 200000 Kbps is 1/5 of line speed, the received rate will actually be 1000
Kbps, or 1/5 of the 5000 Kbps limit set by the storm control command. 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 interface type. (1000BASE-T, 1000BASE 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: Enabled for broadcast
storm control, disabled for multicast and unknown unicast storm control)
◆
Rate – Threshold level in kilobits per second. (Range: 64-1,000,000 kbps;
Default: Disabled for unknown unicast and multicast traffic, 64 kbps 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.
4.
Set the required threshold beyond which the switch will start dropping
packets.
5.
Click Apply.
– 203 –
Chapter 8
| Congestion Control
Storm Control
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