I just got home from work trying to install a CE500 as well. I tested it last night off the network and was able to connect 2 3560's to it and ping with no problems.
I put it on the network tonight and couldn't ping or see it in CDP. Is there a default encap on the ports of the CE500?
I'm connecting the CE500 to a 2611 that's running ISL. When I switched the SFP port on the 3560s to ISL they stopped working and wouldn't come back up. The other thing I noticed was that the FE interface on my the router was set up weird. It has 2 sub interfaces and the primary interface is in VLAN1 and the other is VLAN10. The problem with that is the LAN is the VLAN10 network.
I tried setting up VLAN10 on the CE500 but it didn't work. And w/o the CLI I can't tell if it even see's anything from the router. I also tried to disable VLAN1 on the CE500 but thats not allowed.
I'm thinking about replacing the 2611 w/ a 2621 and separating the subinterfaces onto 2 different physical interfaces.
We normally use the 3750G-12S but I got the CE500 because of the price. I guess you get what you pay for.
Any help would be greatly appreciated.