Authentication for vpn clients - Radius server ??

I have a few sites that have vpn devices which users authenticate local to the device at each site. Instead of setting up the accounts on each device I would like a way to centrally manage those accounts. Most sites are connected via site to site tunnnel over the internet in a hub and spoke topology, so need to come up with the most secure solution possible.
cisco20Asked:
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KendzastConnect With a Mentor Commented:
I prefer ACS server. Basic radius (tacacs+) configuration is easy. Time depends on number of network devices.
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KendzastCommented:
You can use Cisco ACS server or MS ISA server for radius and optionally connect them to MS Active directory.
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cisco20Author Commented:

Whats the difficulty level of setting up  each one ?
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