Allied Telesis AT-S95 WEB - Manual (Page 75)

Configuring Device Security
Configuring Network Security
Page 75
Enabling Storm Control
Storm control limits the amount 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 41: Storm Control Page