Connect three routers to two networks?

Question:

The image of my current WS-C3750X-48P-L Price setup is below. I am tryint to connect the Central router to the ISP router through a switch. Same with the South router. However, I want the Central and South routers to not be on the same network. Central will be 222.222.222.0/30 and South will be 222.222.222.4/30. Packets between Central and South will be routed through the ISP router, including a VPN connection between the two. The problem I am having is that I can't get the crypto map setting to work on subinterfaces, so how can I keep this set up without needing to connect the two routers to the ISP router directly?

The ISP and that switch are meant to represent an Internet connection. This is why I can't have them on the same network.I am still pretty new to this, so forgive my ignorance if I haven't posted all the required information.

Answer:

Add 2 vlans to the 2960; 1 vlan for South and 1 vlan for Central.  create a trunk between the 2960 and the 2811 ISP router.

the configure the sub interfaces on the 2811 that represent each VLAN to be in either 222.222.222.0/30 and the other sub interface in 222.222.222.4/30.

so lets say your fa0/1 on your isp router is connected to the 2960:

fa0/1.100

description central

encapsulation dot1q 100

ip address 222.222.222.1 255.255.255.252

fa0/1.200

description south

encapsulation dot1q 200

ip address 222.222.222.4 255.255.255.252

(syntax off the top of my head)

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