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Concerns raised by OPS AD In reviews of previous versions of the IPCDN DOCSIS QoS MIB, AD Bert Wijnen raised concerns about the use of TOS overwrite (full 8-bit value) Concerns expressed by IETF Area Director and diffserv wg chairman Brian Carpenter The DOCSIS QoS MIB defines ways to potentially modify the ECN bits which might cause serious impact in the network The impact could propagate to the Internet Backbone if diffserv re-marking is not operated properly at trusted boundaries Recommendations to authors: Restrict diffserv marking to DSCP field only (6 bits) Do not allow any spec to alter ECN bits when modifying diffserv service classes Do not use a mask for DS field |