This question is more appropriately asked in the USENET comp.dcom.* hierarchies. -----Original Message----- From: Jaideep Chandrashekar [mailto:jaideepc@cs.umn.edu] Sent: Tuesday, August 08, 2000 1:47 PM To: nanog@merit.edu Subject: question about traffic eng/ Cisco CEF. Hi, I seem to be having some problems trying to use Cisco CEF on a 7200. My problem description is as follows. I need some way of sharing load (connections) across multiple links. The routes are all statically configured and have the same distance (though physically of different lengths). 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. Also ... is there any way to clear the routing table so that when a new link comes up, (and a new route is added to a list of equal cost paths) all the connections are again redistributed across the links. Couldn't seem to be able to make existing connections switch paths. With fast switching ... was able to do this by flushing the routecache .. but cef doesn't use a cache (says the documentation).... Any help is much appreciated. -jaideep
On Tue, 8 Aug 2000 rdobbins@netmore.net 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:jaideepc@cs.umn.edu]
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.
On Wed, Aug 09, 2000 at 12:38:08AM -0400, John Fraizer wrote:
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?
It's not only possible, it's even likely. But that's not the point. It's possible, even likely, that somebody here knows the answer to questions about Star Trek, or needlepoint, or car repair. But this is not the Star Trek mailing list, or the needlepoint mailing list, or the car repair mailing list.
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John Fraizer -
rdobbins＠netmore.net -
Shawn McMahon