I am desiging a large enterprise IPT network. I have been working on CCM since the 2.4 days shortly after Cisco purchased the Selsius product. I have always used the rule of thumb that 500 sites is the limit for a single cluster. The other day I had an engineer tell me I am wrong. I know the technology changes but who is right. I have design two clusters for 814 sites with ICL to connect them. If a couple of you IPT vets tell me I am wrong I will bow down to the newbee.