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8
Three Switching Modes
Note that the Fast Ethernet ports always use the Store and Forward mode.
Feature
Cut-Through
for Token-Ring .
Store and Forward
for both Token-Ring
and Fast Ethernet.
Auto
(Adaptive
Cut-Through)
for Token-Ring.
Table 5. Benefits of the Switching Modes
CrossFire 8730 Switch Reference Guide, DOC-7047 v. 1.1
Function
Switches with
minimum and
constant latency,
approximately 35 µs
Each packet is
forwarded only after
the entire packet has
been received by the
switch. This is used
for data transfer
between LAN
segments of different
speeds or for LAN
segments with a high
error rate.
Cut-through
switching that checks
for error packets. If a
port's errors exceed a
user-defined threshold
then the port switches
to store and forward.
Benefit
Lowest possible switch-latency,
which means optimal response
time for end-users.
Does not propagate errors to
other segments.
Same speed as cut-through
switching, but with built-in
adaptation to errors which
means that bandwidth is
effectively preserved
Introduction
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