Acee,
Please help me to parse your message. It is clear that you want
draft-ietf-lsr-flex-algo-bw-con to specify ASLA's. However, your rationale is
not so clear.
It is not because RFC 8919 mandates ASLA. In fact, we agree that it would be
strange for an RFC to include a mandate that precludes future proposals.
Are any of the following your rationale:
1. Because there is a good technical reason for
draft-ietf-lsr-flex-algo-bw-con to specify ASLA
2. Because it is possible, but not necessary, for
draft-ietf-lsr-flex-algo-bw-con to specify ASLA
3. Because it was the unstated intention of RFC 8919 to include a mandate
that precludes future proposals (although we agree that this would be strange).
For the purposes of full disclosure, I think discussion regarding the first
rationale would be fruitful. However, I don't think very much of the second or
third rationale.
Ron
Juniper Business Use Only
From: Lsr <[email protected]> On Behalf Of Acee Lindem (acee)
Sent: Tuesday, August 10, 2021 4:43 PM
To: [email protected]
Subject: [Lsr] RFC 8919, RFC 8920, Flex Algo, and Flex Algo BW Constraints
[External Email. Be cautious of content]
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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