Are you talking about the one by Albritton? If so, then I second that! It
is very good.
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Javier Contreras
> Sent: Tuesday, September 12, 2000 10:59 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Cisco Express Forwarding
>
>
> Hi!
>
> I would really recommend you get the Inside Cisco IOS architecture book,
> it
> gives a lot of information on the different switching modes of cisco...
>
> In resume, CEF builds the "switching table" in configuration time (instead
> on
> the first packet of a flow, as fast-switching does). To hold the switching
> information
> it uses a "mtrie" instead of a mtree, which allows to reference external
> tables
> instead of pointing to the destinations in the mtree structure (as
> fs,distributed sw do) This external tables are updated every time new
> information is adquired (for
> example, a arp resolution, or cache time out) so the amount of information
> that
> needs to be changed overtime is a lot less than in other switching modes.
> In previous modes, it was necessary sometimes to invalidate the complete
> cache in some cases,
> now only specific entries are changed.
>
> It was designed to support very big caches (it was tested on backbone
> routers),
> so it should be quite ok for most applications. Just take care if you
> enable it in a
> working router, because probably you will need to restart it to get it
> working
> stable again (I did test on a 3640 + ipsec +12.1.3, and it needed a
> restart).
> Other difference is that the switching is done per source and destination
> and not per destination (as Fsw) so the loadbalancing of packets over
> parallel links is better.
>
> Regards.
>
> Bal Sandhu escribi�:
>
> > Guys,
> >
> > does anyone have any information on CEF ?
> > How can I measure the improvements upon its implementation ?
> >
> > cheers,
> >
> > Bal Sandhu
> >
> > e-mail : mailto:[EMAIL PROTECTED]
> > http://www.madge.com
> >
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> --
> ---
> Javier Contreras Albesa
> Standard Trainer
>
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>
> SHAPING THE FUTURE - BE PART OF IT!
>
>
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