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Fast Ethernet Switching System User’s Guide
Web Management
99
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.
For example, 1500 byte packets are delayed by 1200 microseconds in a Store and
Forward device versus 60 microseconds in a Cut-Through device.
Store and Forward requires more memory because the DES-5200 must store the
packet before sending it out.
Advantages of Cut-Through
Cut-Through is faster because the packet is sent as soon as the first 128 bytes are
received.
Cut-Through requires less memory since the DES-5200 only reads the address but
does not store the entire message.
Disadvantages of Cut-Through
Bad packets are perpetuated, taking up bandwidth.
The benefits diminish in high traffic networks.
Cut-Through can not be used on networks that use both Ethernet and Fast
Ethernet. The network must use one or the other.
Follow these steps to change the default setting from Store and Forward to Cut-
Through:
1. Select the down arrow to change the setting.
2. Select Apply. Select Refresh to see the changes.