[Bloat] DOCSIS 3.1 support for AQM

[Greg White]

FYI, the DOCSIS 3.1 specifications were released yesterday.   New in D3.1 is mandatory support for AQM (with default = on).

Cable modems are required to implement a variant of PIE (detailed in Annex M of MAC and Upper Layer Protocols Interface Specification<http://www.cablelabs.com/specifications/CM-SP-MULPIv3.1-101-131029.pdf>) as the default AQM.  Modem vendors are free to implement additional algorithms if they so choose.  CMTSs are required to implement an AQM meeting certain high-level criteria, but the choice of algorithm is left to the implementer.

-Greg
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