Speaking as a WG Member: In reviewing RFC 8919 and RFC 8920, it is clear that the ASLA mechanism was to be used for new link attributes and applications. While the documents do not mandate that there never could be a new way to advertise link attributes, this was clearly the intent. Indeed, it would be strange for an RFC to include a mandate that precluded future proposals. The advertisement enablement and deployment sections of these documents specifically cover future attributes and applications.
Given that we have ASLAs as building blocks, I don’t really see a reason to introduce the generic metric. The proponents say it isn’t an alternative to ASLAs but their examples cite different applications using different metric types (i.e., application-specific metrics). Also, given that ASLA are used by the base Flex Algo draft, it would be inconsistent to diverge for Flex Algo BW constraints. Consequently, I would request that draft-ietf-lsr-flex-algo-bw-con-01 revert to using ASLAs. Based on the LSR Email discussion prior to IETF 111, this was definitely the consensus. Thanks, Acee
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