Clarify Route once/Switch many

Discussion in 'Cisco' started by Nathan Harmon, Jan 19, 2007.

  1. Can someone clarify the concept of route once, switch many? Does that
    mean within a local area network you should be two hops at most between
    any other system? I'm having a hard time seeing how this works in large
    networks with separate access, distribution, and core layers. It seems
    like the distribution and core layers would all communicate on a
    separate VLAN to pass data, thus creating more logical hops.

    Or am I over thinking this?
    Nathan Harmon, Jan 19, 2007
    #1
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  2. The basic issue has to due with the delay imposed by a router on packet
    forwarding - if you can minimize the number of times that datagram
    headers have to be parsed in order to forward them to the appropriate
    end destination, the result will be a reduction in the total system
    delay and an improvement in throughput.

    This is especially useful in a packet train or data flow between two
    peers -- determine the route, then disseminate the path info to the
    (layer-2) switches so that minimal processing occurs, minimizing delay.

    Sincerely,

    Brad Reese
    2007 Cisco Salary Rates
    http://www.bradreese.com/compensation-database.htm
    www.BradReese.Com, Jan 19, 2007
    #2
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