Mine

[Localhost]

[[7200]]
image = \Program Files\Dynamips\images\c7200-jk9o3s-mz.124-17.bin
npe = npe-400
ram = 256

[[router R1]]
f0\0 = SW1 1

[[ethsw SW1]]
1 = access 1
2 = access 1 NIO_gen_eth:\Device\NPF_{74C7E71C-1954-4461-8F4A-77AEEC2F0A39}