Shortcomings of today‘s solution
Whilst some advantages, this approach has several drawbacks to the Internet at large and to the newly multi-homed customer:
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- Large fragmentation of IP address space (bad)
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- Excessive memory and computing power requirements in the Internet core routers (good for Cisco and Juniper)
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- Exhaustion of current AS number space requires upgrade with transition to 32 bit AS numbers (very bad)