CERFnet services California and selected other locations in the US and internationally. CERFnet has direct peering points via CIX, Sprint NAP and other locations. CERFnet is also connected to the CIX-SMDS. CERFnet also uses ICM as well.
Total aggregate traffic is about 8Mb/sec. About 1/2 is going via NY NAP. CERFNET carries full routing at the primary peering points.
http://www.cerf.net /cerfnet/interconnects.html has Push's understanding of the interconnections. He welcomes comments on it. Guy asked if Sprintlink or ICM was the NSP of last resort? Push said that he was waiting for Sprint to tell him and he'd let us know.