North American Network Operators Group

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Re: CEF Load balancing...

  • From: Daniel Golding
  • Date: Sun Jan 16 13:17:03 2000

CEF is safe to a point. We're running it on 11.1CC(30), and it runs pretty
well. We had memory leak problems in earlier versions on the 11.1CC train.
I wouldn't use it for IMUXing, though. Check out Tiara Networks for their
MLPPP engine. It's pretty nifty.

CEF does a nice job of bringing the CPU down on a fully loaded 7513.
That's all i'd use it for, until all the bugs get worked out. I had a bad
experience using CEF on 12.0.5 in the type of situation you are
describing. If a serial flapped, there was a small chance that the router
CPU would go nuts, effectively making the router unmanageable.

On a related note - Any ISPs out there using 12.0(s) yet in widespread

Daniel L. Golding        *  Senior Network Engineer
Network Engineering      *  Mindspring Enterprises
[email protected]  * 

On Fri, 14 Jan 2000, Alex Rubenstein wrote:

> Question (kinda operational)..
> I've been looking/asking around, but have yet been able to get the same
> answer twice to the following question: How many links can you have in
> parallel when using CEF load-sharing per-packet? 
> Another words, we currently have a site that has four DS1s load balanced,
> in parallel (terminating in the same router on each end). Can you add a
> [5th|6th|7th|8th] ?
> Before you answer "BUY A DS3!", this is located in a rural area that a)
> really doesn't (easily) even have DS3 capabilites, and b) isn't cost
> effective to have a DS3 as it is about 15 times the cost of a DS1.
> Thanks for any insight!