Curtis,
For fast switching a hash table is stored in the cache that consists of the
hashed network destination and the next hop MAC header. CEF is a great
improvement over fast switching but even that caches only the destination,
and not the source. For source destination cache your have to go to Netflow
which is only available in the high end platforms, 72xx or better. This is
why access lists and process switching can tank your router performance.
Check out Phill Harris' 'Router Switching Performance Characteristics'
session that he gives at Networkers--I pasted the link to the presentation
below. It is easily one of the best sessions you can take at Networkers,
and the only place I know to get no-nonsense Cisco Architecture info
including information that Cisco will _never_ document.
http://www.cisco.com/networkers/nw00/pres/2203.pdf
If you can't attend Networkers you can buy the tape of the session.
--David
----- Original Message -----
From: "Curtis Phillips" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, March 23, 2001 8:48 AM
Subject: Fast-switched policy routing forwarding table entries..
> Hello,
>
> Does anyone know if source-based policy-routing entries are entered
> in the cache in the form of <source, next-hop> or <source, dest,
next-hop> or ?
>
> What I am trying to establish is whether a seperate route table look up is
performed for every unique source-destination pair, or whether since it is
source-base policy routed, is simply does a single route table look up
> and uses the cached entry for every packet initiated from the same source?
>
>
> Thanks,
>
> Curtis
>
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