Fragmentfree is a CISCO method of switching as cutthrough and store &
forward.
Store & forward needs to wait all the frame, before switching it. This
method permit to check frame validy by CRC calculation, but latency depend
of the size of the frame.
Cut-Through switching wait only the destination address : switching begins
as soon as the destination address is read. So there's no latency problem
here, but transmitted frames can be corrupted.
Fragment free is a good compromise between the two methods : the switch read
only the 64 first bytes of the frame. So latency time is guaranteed and
frame integrity can be a little bit more controlled than in Cut Through.
CAT1900 implement fragmentfree by default.
There's a last method, called adaptive mode : the switch begins in S&F mode,
and if there's no frame error, it change to cutthrough mode.
Hope it helps.
--
Stephane LITKOWSKI
Student in a french computer science school
EPITA Telecom & Network specialization
CISCO Certified Network Associate
EMail : stephane.litkowski@xxxxxxxx
""Marcial Rosales Garcia"" a icrit dans le message
news: 200110051104.HAA00320@xxxxxxxxxxxxxxxxx
> Hi Folks,
>
> I would like to know where can I find more information about one of
> the type of switches called FragmentFree. I have been reading Todd Lammle
> but I don't have it very clear. I understand the FragmentCheck but not
> FragmentFree.
> I have searched in several networking searchers like
> searchNetworking.com that has help me in some stuff.
>
> Thank you very much.
>
> Marcial Rosales
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