CEF - per packet load balancing (3560) ?

[mcroft]

Hi,

Can anyone please confirm is Per packet load balancing is supported in the 3560's ?

I am going around in circles, and can't find a definate Y or N answer.

I have a suspicion this CEF feature is only available on routers.

pleas help.

Many Thanks

Matt

[Frederic Vanderbecq]

Hello,

Load-balancing should be supported on the 3560:

3560(config)#ip cef load-sharing algorithm ?
  original   Original algorithm
  tunnel     Algorithm for use in tunnel only environments
  universal  Algorithm for use in most environments

[cadet alain]

Hi,

go to a routed interface or SVI and see if you can issue ip load-sharing per-packet  command.

Regards.

Alain.

[Joseph W. Doherty]

Disclaimer

The    Author of this posting offers the information contained within this    posting without consideration and with the reader's understanding that    there's no implied or expressed suitability or fitness for any  purpose.   Information provided is for informational purposes only and  should not   be construed as rendering professional advice of any kind.  Usage of  this  posting's information is solely at reader's own risk.

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In    no event shall Author be liable for any damages whatsoever  (including,   without limitation, damages for loss of use, data or  profit) arising  out  of the use or inability to use the posting's  information even if  Author  has been advised of the possibility of such  damage.

Posting

NB: On a 3750X (12.2(55)SE1) - only ip load-sharing per-destination available on SVI and routed port.

PS:

To original poster, if CEF per-destination flow balancing not "good enough" perhaps Etherchannel?

[cadet alain]

Hi,

What about the 3560 ? Is it also only permits per destination load-sharing?

Regards.

Alain.

[Joseph W. Doherty]

Disclaimer

The    Author of this posting offers the information contained within this    posting without consideration and with the reader's understanding that    there's no implied or expressed suitability or fitness for any  purpose.   Information provided is for informational purposes only and  should not   be construed as rendering professional advice of any kind.  Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In    no event shall Author be liable for any damages whatsoever  (including,   without limitation, damages for loss of use, data or  profit) arising  out  of the use or inability to use the posting's  information even if  Author  has been advised of the possibility of such  damage.

Posting

cadet alain wrote:
Hi,
What about the 3560 ? Is it also only permits per destination load-sharing?
Regards.
Alain.

Without trying similar command on actual 3560, don't know for sure, but if a 3750X with relatively recent IOS only supports destination load-sharing, I would suspect 3560 would too.

[p.mcgowan]

IP CEF is disabled by default on switches, to enable enter the following command in global configuration mode;

ip cef

[cadet alain]

Hi,

The default configuration is CEF enabled on all Layer 3 interfaces

this is taken from the 3560 configuration guide: http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_se/configuration/guide/swiprout.html#wp1109701

Regards.

Alain.

[Peter Paluch]

Alain,

You are correct. CEF is active on 3560 series by default. In fact, to my best knowledge, you can not deactivate the CEF on multilayer switches at all because it is the fundamental way they operate. Deactivating CEF would be similar to deactivating the TCAM.

Best regards,

Peter