From: anthony.sequeira@thomson.com
Date: Tue Jan 16 2007 - 19:15:16 ART
The term Layer 3 switching comes from the fact that AT SOME POINT, the
Layer 3 ROUTING table can be avoided and traffic can be switched to the
egress port.
In early "route-caching" or "route once, switch many" technologies - the
Layer 3 router would be consulted initially, and then a cache entry
would be built for subsequent traffic to the destination.
In modern Cisco implementations - it is more like "route never". Cisco
Express Forwarding builds a copy of the routing table in memory for the
purposes of switching traffic as quickly as possible.
So I have no problem with the term Layer 3 switching - as we are not
routing in the traditional sense.
I guess the counter argument is that the routing table is still
instrumental in the process.
Anthony J Sequeira
#15626
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Nirav Jasmine
Sent: Tuesday, January 16, 2007 2:29 PM
To: ccielab@groupstudy.com
Subject: Layer 3 switching
We are having a debate that layer 3 switching is not actually switching
but
routing instead. What are your opinion?
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