Jessica, I suspect that most providers have a classful network number within a CIDR block that does not have production hosts on it which they can use for this kind of testing. Thus, this does not have to be a test using live traffic. Testing would look like: Send in specific classful routes including the "test network" Send in aggregate route Test connectivity ala Havard ... Withdraw the test network route Test connectivity ala Havard from a test station on the "test network" If everything is okay, then removing the rest of the specific network number routes would seem to be okay. It may be necessary to this on an aggregate by aggregate basis until all of the operational configuration issues are wrinkled out. This would seem to meet your safety concerns. peter