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IPv6:BGP,RIB,FIB memory and cpu overhead d own the 5years

Implementing the 6PE/6VPE approach in 12k with XOR and IOS and in 7200(NPE-400,NPEG-1,NPEG-2) and in 7600 routers

What is the bgp memory overhead when implementing the 6PE or 6VPE approach when implementing IPv6 customers in a service provider environment? taking into consideration of 5 years from now

Also what will be the impact or required memory for FIB/RIB and CEF related options when doing this 6PE or 6VPE approach in terms of 5 years from now??

Any special alogrithm to deal with the bgp scan time and memory overhead of ipv6 prefixes??? also in RIB and FIB enteries ??