From: Holmes (iamholmes@eml.cc)
Date: Tue Nov 08 2005 - 12:55:07 GMT-3
Hi all -
I'm looking at a load-balancing case, where IP per-packet
load balancing is being done. (I'm using cef, and ip load-sharing
per-packet).
Briefly, if we were doing load balancing over 2 T1 links, router
to router, say a router has 2 serial interfaces, if route-cache were
enabled, it doesnt always have to do a look up, but would
have an entry that for any traffic with this source / destination
pair and send all further traffic over this interface (basically
per-session or per destination load balancing).
With cef, there no such source/destination pair stored, its a
little more CPU intensive, but we can get IP packet level
load-balancing.
Now to my question :
Why is `ip route-cache / no ip route-cache configured at the interface
level, and not at the global level ? Isnt the decision to send a
packet out to a certain destination over a certain interface made
before-hand ie. If you configure no ip route-cache at the interface
level,
isnt it too late, the path / interface has already been chosen.
Thanks for any replies.
-- Holmes iamholmes@eml.cc-- http://www.fastmail.fm - Or how I learned to stop worrying and love email again
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