North American Network Operators Group

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RE: question about traffic eng/ Cisco CEF.

  • From: John Fraizer
  • Date: Wed Aug 09 00:40:28 2000

On Tue, 8 Aug 2000 [email protected] wrote:

> This question is more appropriately asked in the USENET comp.dcom.*
> hierarchies.

Why do some people find it necessary to post snide remarks vs posting an
informative reply?  Don't you think it is possible that someone on NANOG
might perhaps know the answer of this question and be able to answer?  Was
your snide remark intended impose a better S:N ratio in the list?  If so,
it would have been much better served had you posted it in private and
even better had you not posted it at all!

Sorry to all the other readers of the list but, I just can't stand this
"We're too good to answer your question" bull!

> -----Original Message-----
> From: Jaideep Chandrashekar [mailto:[email protected]]
> When I enable cef and set it to share load on a per destination mode, for
> some reason, all the traffic to a destination takes a single route
> .. though the route table shows two equal cost paths.
> The only point I might be missing is that I am looking at very few
> connections (2-3) and that load sharing with cef might be engineered to
> share load in a statistical sense (only kick in with large number of
> connections).
> Could anybody throw any light on this.

I may be wrong but, from what I can remember, what you describe as being
the problem is actually it working as designed.  Each time a new flow is
encountered, it is checked against the current tables.  If an interface
has not already been assigned to that destination prefix, it is done so
then.  If you have two total destinations, you're going to end up with one
on each of your links.

Feel free to correct me if I'm wrong folks.  Just please, do it kindly.  

John Fraizer
EnterZone, Inc.