Switching modes: Cut-thru vs store & forward vs Fragment Free

From: Tim (ccie2be@nyc.rr.com)
Date: Tue Mar 07 2006 - 12:29:41 GMT-3


Hi guys,

 

As anyone who has taken Cisco's ICND class may recall, a switch will use one
of the above transmission modes to forward frames.

 

Given how fast switches are today - wire speed - who cares which mode is
used?

 

Does it ever matter?

 

If we compare the latency of the fastest mode, Cut-thru, to the slowest
mode, Store & Forward, is the difference big enough to even measure?

 

Assuming it does matter for some reason, is there a show command that tells
which mode is being used and what is the command to change modes?

 

TIA, Tim



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