his topics seems to come back periodically. Good that I saved my original
reply from a few months back:
The answer has to do with the IEEE 802.3 standards. There are actually two
models how to calculate a "valid" ethernet network.
Model 1: Simplified model widely known as 5-4-3 rule.
Model 2: Calculation of Roundtrip delay (<576 bit times) and Interframe Gap
shrinkage (50 bit times)
In model 1, there can be 5 segments connected by 4 repeaters, but only 3 can
have stations on them (half duplex mode), the other 2 MUST BE link segments
(full duplex, for instance fiber).
Check out this excellent Website of the Ethernet guru: Charles Spurgeon.
http://www.ots.utexas.edu/ethernet/ethernet.html the entrance to his website
http://www.ots.utexas.edu/ethernet/10quickref/ch7qr_5.html#HEADING4
outlines model 1
http://www.ots.utexas.edu/ethernet/10quickref/ch7qr_6.html#HEADING5 outlines
model 2
For a definite source on Ethernet (besides the IEEE 802.3 specs) I highly
recommend his excellent Ethernet book:
http://www.bellereti.com/ethernet/edg/edg.html
Chapter 13 of this book is online and it talks about .... the 5-4-3 rule !!!
Cheers,
Willy Schoots
Lucent NPS
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Reinhold Fischer
Sent: Tuesday, August 29, 2000 3:41 PM
To: Hitesh Pathak (CSD-BBYRO-RTSG)
Cc: 'Suresh Uniyal'; '[EMAIL PROTECTED]'
Subject: RE: 5-4-3 Rule
Sorry, you are wrong ;)
the rule defines that you canNOT have more than 5 segments with 4 repeaters
and NO more than 3 segments can be populatet.
hth,
Reinhold
--
Reinhold Fischer
CCNP/SCSA/HP Certified Consultant for Network Management
On Tue, 29 Aug 2000, Hitesh Pathak (CSD-BBYRO-RTSG) wrote:
> It defines a general networking setup like if u have a single network then
> it should have 5 segments , 4 repeaters & out of 5 segments atleast 3
should
> be populated ie. on 3 segments you should have some node connected.
>
> group , pls correct me if I'm wrong.
>
> HP
>
> > -----Original Message-----
> > From: Suresh Uniyal [SMTP:[EMAIL PROTECTED]]
> > Sent: Tuesday, August 29, 2000 4:29 PM
> > To: Cisco (E-mail)
> > Subject: 5-4-3 Rule
> >
> > Hi all,
> >
> > What is 5-4-3 rule?
> >
> > -SU
> >
> > ___________________________________
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