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Rejected Alternatives Use TLV Encoding instead of length field In general, a better solution, but Simpler not to introduce a new type Given existing deployment of strange encoding solutions for all cases but 4-over-6, hardly seems worthwhile to have a “purer” solution for this one case New AFI/SAFI for 4/6 case More complicated Operationally Update for given NLRI would change AFI/SAFI as it travels, introducing all kinds of corner cases to track down. |