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GETVPN and DMVPN equipment for 250 routers as GM


I would like to know which router I should use as a key server for 250 GMs, and what router as DMVPN hub.

I found this deployment guide

on site 24 it says that 2851 with AIM-VPM module has been tested with 200 GM with 15 sec registration time with one key server.

The problem is that there is a new generation of ISRs. I would like to use a 2900 router but don't know if the 2951 is necessary. 2951 has onboard IPSec acceleration but an adittional ISM-VPN-29 module can be installed.

In the data sheet (

I did not have found any info if this module is responsible for GETVPN rekeying. I don't want to buy it if it's not really necessary because it's not cheap.

So my question is which 2900 router should I use as a Key server for 250 GMs and what 2900 router as DMVPN hub?

I hope that somebody can help me with this.