AIM Module

Unanswered Question
Feb 11th, 2009

Hi folks -

I have a couple of Cisco 2811 routers with AIM module in it. Can anyone tell me what this AIM module is for? From what I've read on the Internet, this is the module for better IPSEC VPN performance.

Our 2811 router's motherboard already have an integrated VPN port adapter. I am assuming this is another hardware module for better VPN performance. So I guess what is the difference between the VPN port adapter and the AIM Module?

Also, isn't the IOS in the router capable of handling VPN connections? Do we really need these additional h/w modules?

Thanks very much for your help!

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Overall Rating: 5 (1 ratings)
Paolo Bevilacqua Wed, 02/11/2009 - 14:12

First, check which exact AIM module you have with "show diag", as there are various models.

The module will become necessary only when handling a large volume of traffic or many peers. Another application is SSL VPN.

Otherwise as you said the embedded HW accelerator is enough for most cases.

ksarin123_2 Wed, 02/11/2009 - 14:15

The AIM module we have is (AIM-VPN/EPII-PLUS).

So again, my question is, what functionality does this module provide that the integrated VPN port adapter does not?


Paolo Bevilacqua Wed, 02/11/2009 - 14:44

Hi Edison, actually what the datasheet says is that WITH the AIM-VPN/EPII-PLUS (now replaced by AIM-VPN/SSL-2), you can do 1500 sessions.

Then from the infamous "VPN portfolio" document, we learn that it would do 200 without, and again 1500 with AIM-VPN/SSL-2 that is the replacement for the older type.

At least I understand it this way.

Paolo Bevilacqua Wed, 02/11/2009 - 15:13

You want to be really really confused ?

Compare whatever document figure with your own stringent performance testing :)


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