sfdp -Tpng > net.png << EOF
graph net {
node [fontname=ubuntu,shape=none,labelloc=b,image="../misc/router.svg"] edge [fontname=ubuntu,shape=none]
//r1
  r1 -- r3 [weight=10] [taillabel=eth1] [headlabel=eth1]
//r2
  r2 -- r3 [weight=10] [taillabel=eth1] [headlabel=eth2]
//r3
  r3 -- r4 [weight=10] [taillabel=eth3] [headlabel=eth1]
//r4
  r4 -- r5 [weight=10] [taillabel=eth2] [headlabel=eth1]
//r5
  r5 -- r6 [weight=10] [taillabel=eth2] [headlabel=eth1]
  r5 -- r7 [weight=10] [taillabel=eth3] [headlabel=eth1]
//r6
//r7
}
EOF