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Cell Relay Retreat>List Archive>month:1998-Jun> msg00122



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Re: Pathchar problems evaluating switched networks

  • From: Michael Slavitch <slavitch@loran.com>
  • Date: Wed, 24 Jun 1998 10:21:48 -0400

Yes, that's correct. In snmp, the sum of IfInOctets and IfOutOctests
would
be > 10 Mbits/sec. Individually, the ceiling is 10Mbits/sec.

On 'real' Ethernet, such as 10base2, total bandwidth is 10mbits since
it's a 
single wire, and full-duplex is impossible. Full duplex takes advantage
of
different paths for input and output, meaning effective 'throughput',
which
(for most LAN systems is bidirectional) is higher than the 10mbit
maximum.

Full-duplex 100BaseTx backbones commonly exceed 100Mbits in sustained
traffic
because the traffic is statistically even in a well-balenced network.


-- 
Michael Slavitch   <slavitch@loran.com>   http://www.loran.com/~slavitch

"Being Canadian is like living next door to the Simpsons" - Molly Ivins