Nating question

Unanswered Question
Sep 23rd, 2009

Hi Experts,

It is a design query. I hope you will shed some light on this.

I learned that NAT support is not available in CISCO 3560 L3 switches and even 4500 Switches. It start only from 6500 Switches.

What is the reason Cisco switches is not able to support NAT feature in 3560 Switches.

The link clearly says this:

Thanks in advance


I have this problem too.
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naveen_b81 Thu, 09/24/2009 - 00:50

There is probably no provision for maintaining the NAT table in the switches.

Peter Paluch Thu, 09/24/2009 - 00:58


Personally, I think it is mostly a marketing decision. The problem of hardware support for NAT is, I believe, already solved as the NAT is supported in Cat6500, for example. It should not be a problem to augment the Cat3560 with the proper ASICs to perform NAT, however, the Cisco probably does not want to place the Cat3560 into the enterprise edge layer where the external connectivity is provided, as it has different products for that purpose. The Cat3560 is intended for access or lower-demand distribution layers.

Best regards,


snarayanaraju Sun, 09/27/2009 - 02:15

Hi Peter,

I too have a same thought.

Do you have any idea is there any other OEM supports NAT in their Distribution Layer switches.


Laurent Aubert Sun, 09/27/2009 - 13:10


NAT is not supported on 35xx platform due to hardware limitation.

ASICS of the PFC on 6500 are far more advanced than the one used on low-end switches.




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