eth300 0Mbps a b
eth400 0Mbps b c
eth500 0Mbps c d
# DIF n1 spans a,b and c and runs over the shimsdif n1 a 300dif n1 b 300 400dif n1 c 400# DIF n2 spans c and d and runs over the shimsdif n2 c 500dif n2 d 500# DIF n3 spans over n1 and n2dif n3 a n1
dif n3 c n1 n2
dif n3 d n2