Re: CEF Polarization?

Hi Muzammil,

CEF is using a hash function. By default, on recent IOS, its using the IP
addresses of the packet.

You can fine tune it:

R4(config)#ip cef load-sharing algorithm ?
  include-ports Algorithm that includes layer 4 ports
  original Original algorithm
  tunnel Algorithm for use in tunnel only environments
  universal Algorithm for use in most environments

You can see how exactly CEF will switch your packets using:

R4#sh ip cef exact-route ?
  A.B.C.D Source address of session

HTH,
Dan #13685 (RS/Sec/SP)
Troubleshooting blog: http://dans-net.com

On Tue, Mar 16, 2010 at 5:43 PM, Muzammil Mukhtar <
muzammil_mukhtar_at_hotmail.com> wrote:

> Hello Group,
>
> I ve a question about the issue I am experiencing. I want to load-share
> the
> traffic across two links but it is not being shared properly. CEF is
> showing
> traffic share of 1 and 1 for each path but in actuall traffic is going out
> more from link compare to other.
>
> Could some one shed some light on what CEF Polization is? In my
> understanding
> CEF polarization happens where the decision is made on each/different
> levels.
>
> Thank you,
> ...Muzammil
>
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Received on Tue Mar 16 2010 - 18:02:18 ART