GarrettCom Magnum MNS-6K - Manual (Page 98)

M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
where
xonlimit can be from 3 to 30, default value is 4
xofflimit from 3 to 127, default value is 6
Syntax show flowcontrol
Back Pressure
Back Pressure is for half duplex operations and the controls provided indicates the
number of buffers allowed for incoming traffic before a xon/xoff message is sent.
Disabled (default) – The port will not use back pressure based flow control mechanisms.
Enabled – The port uses 802.3 Layer 2 back off algorithms. Back pressure based
congestion control is possible only on half-duplex, 10-Mbps Ethernet ports. Other
technologies are not supported on Magnum 6K family of switches.
Syntax backpressure rxthreshold=<value>
where
rxthreshold value can be from 3 to 127, default is 28
Syntax show backpressure
Backpressure and Flow control are to be used in networks in
which all devices and switches can participate in the flow control
and back pressure recognition. In most networks, these techniques
are not used as not all devices can participate in the flow control
methods and notifications. Alternately, QoS and other techniques
are widely used today.
In the example below, the Magnum 6K family of switches are setup with flow control and
back pressure.
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