We are going to increase the weights on the ring in Paris between
the 4 routers on th1/th2/gsw-1/gsw-2 to minimize the use of
gsw-1/th1 and gsw-2/th2 and more gsw-1/gsw-2 and Th1/Th2.
Normally the network is symmetrical between the top and bottom:
http://weathermap.ovh.net/backbone