Here's the scoop. This has been through all levels of the various backbone providers between Shaw and ReefCentral.
The problem is with Shaw, actually. The reason the router at our ISP is having such problems with packets being directed to Shaw customers is because Shaw is not broadcasting any network information to Level3 (the main backbone provider between Shaw and ReefCentral). Because there is no BGP protocol information, the RapidSys routers have no idea where to send packets.
More information on BGP for those interested:
http://www.cisco.com/univercd/cc/td/...to_doc/bgp.htm
Shaw IS a customer of Level3, according to Level3. So, they can escalate this with Level3 tech support. I'm not a customer of Shaw Cable, so I don't really have any say with their tech support, but if you folks want to raise this issue, feel free.