Instructions

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Gigabit Ethernet PoE+ Web-Managed AV Switch User Manual
FLOW CONTROL
IEEE 802.3x Flow Control is the process of managing the rate of data transmission between two nodes (i.e.,
the switch and a connected network client) to prevent a fast sender from overwhelming a slow receiver. It
provides a mechanism for the receiver to control the transmission speed, so that the receiving node is not
overwhelmed with data from the transmitting node. That sounds like it is a good thing, and it is. So why is
the option by default set to “disabled”? The short answer is because you normally don’t need it and because
it can, in very rare instances, have a negative impact on the overall performance in your network. The TCP
protocol already provides its own Flow Control mechanism, allowing a sender to throttle back the speed if the
receiver is having problems keeping up.
The following image shows the options for Flow Control. Users can enable and disable the Flow Control of
each port here.
BROADCAST STORM CONTROL
Storm control prevents LAN interfaces from being disrupted by a broadcast storm. A broadcast storm occurs
when broadcast packets flood the subnet, creating excessive traffic and degrading network performance.
Errors in the protocol-stack implementation or in the network configuration can cause a broadcast storm.
The switch allows configuring maximum allowed pps rates for three different types of packets (Broadcast,
Multicast and Unicast). The following image shows the Broadcast Storm Control page. This page is used to
turn on or off Broadcast, Multicast and DLF Suppressions and apply a rate limit. The default rate limit is 64 kbps.
Switch
Switch