Allied Telesis AT-S100 - Manual (Page 51)

AT-S100 Management Software User’s Guide
51
receive any more traffic, it notifies another port to stop sending traffic until
the condition clears. When the local device detects congestion at its end, it
notifies the remote device by sending a pause frame. After the remote
device receives a pause frame, the remote device stops sending data
packets. Flow control prevents the loss of data packets during the
congestion period.
The flow control command determines whether flow control is set to
transmit or receive on a port. Flow control is set on a per port basis. The
basic command syntax is:
flowcontrol send|receive on|off
To set the flow control to transmit on port 7, enter the following commands:
switch# configure terminal
switch(config)# interface ge7
switch(config-if)# flowcontrol send on
For more information about this command, see “FLOW CONTROL SEND”
on page 170.
To set the flow control to receive on port 8, enter the following commands:
switch# configure terminal
switch(config)# interface ge8
switch(config-if)# flowcontrol receive on
For more information about this command, see “FLOW CONTROL
RECEIVE” on page 169.
Preventing
Broadcast Storms
Flooding techniques are used to block the forwarding of unnecessary
flooded traffic. A packet storm occurs when a large number of broadcast
packets are received on an interface. Forwarding these packets can cause
the network to slow down or timeout.
Use the STORM-CONTROL command to specify the rising threshold level
for broadcasting, multicast, or destination-lookup-failure traffic. The storm
control action occurs when traffic reaches the level specified with the
LEVEL parameter. By default, storm control is disabled.
To prevent broadcast storms, enter the following commands:
switch# configure terminal
switch(config)# interface ge2