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Fast Ethernet Switching System User's Guide
Switch Control
Switch Control, displayed in Figure 26, enables you to set the Address Aging.
Figure 26: System Rate Control
Rate Control
Store and Forward is a global setting that affects all the ports except the RS-232
port.
Store and Forward means that when the DES-5200 receives an incoming packet it
"stores" the packet until the entire data packet has been received before it
"forwards" the packet to a destination.
Advantages of Store and Forward
Store and Forward only sends out valid data packets. Bad packets created by
collisions on the network or damaged packets are filtered out.
Store and Forward is necessary when some devices on the network run at 10
Mbps and others run at 100 Mbps.
Disadvantages of Store and Forward
Store and Forward requires more time because it receives the whole packet before
sending it out. Every byte buffered is an additional eight microseconds of delay.
Managing the DES-5200
51
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