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Allied Telesis AT-8000S Switch
Web Browser Interface User’s Guide
Enabling Storm Control
Storm control limits the amount of unknown Unicast, Multicast and Broadcast frames accepted and forwarded by
the device. When Layer 2 frames are forwarded, Broadcast, and Multicast frames are flooded to all ports on the
relevant VLAN. This occupies bandwidth, and loads all nodes on all ports.
A Broadcast Storm is a result of an excessive amount of broadcast messages simultaneously transmitted across a
network by a single port. Forwarded message responses are heaped onto the network, straining network
resources or causing the network to time out.
Storm control is enabled for all ports by defining the packet type and the rate the packets are transmitted. The
system measures the incoming Broadcast and Multicast frame rates separately on each port, and discards the
frames when the rate exceeds a user-defined rate. The Storm Control Page provides fields for configuring
broadcast storm control.
To enable storm control:
1. Click Network Security > Storm Control. The Storm Control Page opens:
Figure 31: Storm Control Page
The Storm Control Page displays the Zoom View of device ports.
2. Select a port to configure. The port indicator changes to Port is selected (white).
3. Click Modify. The Storm Control Configuration Page opens: