We have decided to replace the Mom & Pop ISP (M&P) with our telephone CLEC SP (CLEC). We would keep the Comcast link which is primary. We are only advertising the default route. Can I bring up the new service without notifying the old ISP? I have a third router I can use temporarily. I would think it would be as simple as: 0) Bring up new CLEC ISP on new temp router (2921). No BGP at this time. 1) Provide Comcast with the CLEC AS and schedule a BGP "activity" 2) At time of switchover, gracefully shutdown BGP on M&P router (4331). 3) Bring up BGP on temp router (2921) and work with both Comcast and CLEC to see each other. 4) Once up, change the configuration on 4331 that was connected to M&P and move new CLEC connection from Temp 2921 to 4331. 5) Schedule a fail-over test to CLEC ISP if this can't be done right then. 6) Cancel service with M&P ISP. Am I missing anything?
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