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What are the default gateways on the pcs?Have you tried assigning no ip on e0? What result do you get if you do traceroute from the pcs?What is the result of "show dlsw peer" and "show dlsw circuit" commands?what is the ip 10.10.10.1?try changing the...
If you want to isolate at Layer 2 then you can consider private vlan. But the combination mentioned by you might be a bit difficult. But study private vlan and see how you can use it for your requirement.