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For a routing decision you don't need 32 bits for an IPv4 prefix, and you do not need 128 bits for an IPv6 prefix. Exact. A international routing decision can be limited to the first 64 Bits. The remaining 64 Bits are some sort of ARP-replacement.

nope. folk are using /126s internally, and have igp or ibgp carrying those prefixes. of course, they also have the classic loopbacks for bgp, which can be /128s. real hardware vendors know this and don't make the same mistakes as were made in the old a/b/c days.

randy

I thought we were talking about the routing table size and memory requirements for the DFZ. Are you implying that we will see those more specific /126s or /128s in the global routing table? Wilfried.