Using Broadcast Storm Control - 3Com 3CRDSF9PWR-US - OfficeConnect Managed Fast Ethernet PoE Switch User Manual

98 C 4: M
HAPTER ANAGING
Using Broadcast
Storm Control
D S
EVICE ECURITY
Broadcast Storm Control limits the amount of 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.
Broadcast Storm Control is enabled for all ports by defining the packet
type and the maximum rate at which the packets can be 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 packet threshold is ignored if Broadcast Storm Control is Disabled.