Stuart,
I do not think any packets could be switched without CPU. Fast switching
needs CPU, it just does not need the CPU to call the ip input process. If
the router needs to search the routing table, it will need ip input process,
other than that, the CPU can use cache during one interrupt. As you
mentioned there are different cache, it all depends on how the router creats
them.
Just my 2 cents.
Thanks
Jack
""Stuart Potts"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> Brief:
>
> Fast switching is as follows, 1st packet is processed switched, 2 packet
to
> destination is fast switched. i.e. it never goes through the cpu.
>
> L3 switching , MLS, Multi layer switching, This is based on traffic flows,
> ie we could swich on a certain tcp flow, or certain source/detination and
> destination port. as defined by access lists.
>
> The three flow masks are as follows:
>
> destination-ip—The least-specific flow mask. The MLS-SE maintains one MLS
> entry for each destination IP address. All flows to a given destination IP
> address use this MLS entry. This mode is used if there are no access lists
> configured on any of the MLS-RP interfaces.
>
> source-destination-ip—The MLS-SE maintains one MLS entry for each source
and
> destination IP address pair. All flows between a given source and
> destination use this MLS entry regardless of the IP protocol ports. This
> mode is used if there is a standard access list on any of the MLS-RP
> interfaces.
>
> ip-flow—The most-specific flow mask. The MLS-SE creates and maintains a
> separate MLS cache entry for every IP flow. An ip-flow entry includes the
> source IP address, destination IP address, protocol, and protocol ports.
> This mode is used if there is an extended access list on any of the MLS-RP
> interfaces.
>
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/layer3/m
> ls.htm#xtocid171391
>
> http://www.cisco.com/warp/customer/473/55.html
>
> /Stuart.
>
>
> -------------------------------------------------------------------------
>
> | | Stuart Potts
> ||| ||| Customer Support Engineer
> .|||||. .|||||.
> .:|||||||||:.:|||||||||:.
> c i s c o S y s t e m s Email: [EMAIL PROTECTED]
>
> "Empowering the Internet Generation"
> -------------------------------------------------------------------------
>
>
>
>
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Dove
> Sent: Wednesday, March 07, 2001 7:02 AM
> To: [EMAIL PROTECTED]
> Subject: Confuse about Fast Switching and Layer 3 switching
>
>
> Hi,
>
> I have some confuse about the "Fast Switching" and "Layer 3 switching".
Both
> of them are mentioned that route first packet and switch others. Could
> anyone please help me?
>
> Regards.
> dovelet
>
>
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