s1/0 LINK1
s1/1 LINK2
s6/1 LINK3
s1/2 Customer-A
s1/3 Customer-B 
s3/0 Customer-C
s3/3 Customer-D
s3/1 Customer-E
s3/2 Customer-F
s6/2 Customer-G
s3/4 Customer-H
s6/3 Customer-I
