In addition to these links, Packet Magizine has a few very good
technical overviews of CEF and its capabilities.
search CCO for "CEF Packet magazine"
DaveC
Tony Medeiros wrote:
>
> Try these links. Lots of the infromation is scattered around. Of course
> it's all IOS version and platform dependent
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/bgppro
> p.htm
>
> http://www.cisco.com/warp/customer/cc/pd/rt/7200/nse1/prodlit/nse1_ds.htm
>
> http://www.cisco.com/warp/public/105/20.html
>
> Hope this helps,
> Tony M.
> #6172
>
> ----- Original Message -----
> From: NRF
> To:
> Sent: Sunday, May 20, 2001 4:56 AM
> Subject: Can fast switching/CEF handle QoS/ext. [7:5180]
>
> > I would like to know if anybody can tell me how or even if fast-switching
> > and CEF handle special packet handling decisions like extended
> access-lists,
> > policy-routing, QoS (like queuing, CAR, WRED). From reading the
> CiscoPress
> > book "Inside Cisco IOS Software Architecture", I understand how
> > fast-switching and CEF work in normal packet forwarding situations. But
> > what happens when more intelligence is needed in packet forwarding, like
> in
> > situations mentioned above?
> >
> > I am well aware of the command "ip route-cache policy", which seems to
> imply
> > that a policy route can be cached for fast-switching. I am interested in
> > finding out how this really works. Because I can make a policy route
that
> > matches on so many different things (source IP, IP precedence/TOS value,
> > packet length,etc.) and can change so many different things (next hop,
> > default next hop, prec/TOS, etc.), it seems to me that the tree or trie
or
> > whatever logic structure IOS may use would quickly become overwhelmed by
> the
> > sheer number of possibilities. Which makes me wonder whether the router
> can
> > really cache the policy at all, or if it can, should it (as opposed to
> just
> > process-switching the packet).
> >
> > Thanx
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> FAQ, list archives, and subscription info:
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