7 # Links in the physical topology, gleaned from looking at the Internet2
8 # and NLR topology maps. Link (a, b) connects sites with IDs a and b.
10 links = [(2, 12), # I2 Princeton - New York
11 (4, 5), # NLR Chicago - Houston
12 (4, 6), # NLR Chicago - Atlanta
13 (4, 7), # NLR Chicago - Seattle
14 (4, 9), # NLR Chicago - New York
15 (4, 10), # NLR Chicago - Wash DC
16 (5, 6), # NLR Houston - Atlanta
17 (5, 8), # NLR Houston - Los Angeles
18 (6, 10), # NLR Atlanta - Wash DC
19 (7, 8), # NLR Seattle - Los Angeles
20 (9, 10), # NLR New York - Wash DC
21 (11, 13), # I2 Chicago - Wash DC
22 (11, 15), # I2 Chicago - Atlanta
23 (11, 16), # I2 Chicago - CESNET
24 (11, 17), # I2 Chicago - Kansas City
25 (12, 13), # I2 New York - Wash DC
26 (13, 15), # I2 Wash DC - Atlanta
27 (15, 19), # I2 Atlanta - Houston
28 (17, 19), # I2 Kansas City - Houston
29 (17, 22), # I2 Kansas City - Salt Lake City
30 (19, 20), # I2 Houston - Los Angeles
31 (20, 21), # I2 Los Angeles - Seattle
32 (20, 22), # I2 Los Angeles - Salt Lake City
33 (21, 22)] # I2 Seattle - Salt Lake City