Request for opinion - central admin user server LDAP+FreeRADIUS

[Andres Kaaber]

Hello all
I'm assigned with a project to make a central admin user database for all kind 
of servers / devices you can imagine (routers, switches, firewalls, linux 
servers, windows servers, databases, etc.). The point is that when a news 
employee arrives you just make him a user in this database, maybe check which 
type of devices he can and all the devices are configured to authenticate users 
against this db. We have over 200 switches alone in our company so making user 
accounts in every single one of them and when this dude leaves to disable all 
of them is huge (or impossible) work.
So I thought a linux server LDAP+FreeRADIUS for authentication sounds quick, 
easy and good solution, or not? There is no problem with servers Linux and 
Windows servers can authenticate against radius. Most popular DB -s can do 
this also (Oracle, MySQL, PostgresSQL). I don't know about Cisco switches and 
roters but as far I found in google there should be no problems the same goes 
for juniper devices.
So what do you think? Or maybe you know a free software solution for this kind 
of problem already? Sun identity management is one that i checked out but it 
seems too bloated and complicated. So what are your thoughts?
-- 
Andres Kaaber