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Problems of FMIP and Fast RA (1/3) Many facilities to be up graded (expensive) With FMIP or Fast RA, all of ARs in service area MUST be up graded, and the ARs need to exchange messages for HOs. So, the number of facilities to be upgraded may be numerous, and connectivity between every pair of different venders and kinds of ARs shall be assured. The fewer facilities to be upgraded the better, and less correlation between facilities is better. |