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auto-ingest: ietf-elements backfill — 129 new elements (2026-05-24)
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document: rfc-2331
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kind: design-rationale
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summary: For IP router interconnection with ABR, a non-zero Minimum Cell Rate provides a bandwidth commitment analogous to a provisioned leased-line capacity, which is distinct from per-flow IIS reservations and helps prevent starvation of the aggregate best-effort traffic.
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section: Appendix B
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topics:
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- ip
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- qos
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- congestion
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: design-rationale
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summary: Frame discard is based on 'Partial and Early Packet Discard' strategy [ROM94] and applies to all ATM services except loss-less CBR; it is recommended for all IP SVCs because network entities that do not support it must still forward the signaling, enabling graceful degradation.
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section: "7"
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topics:
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- ip
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- congestion
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: design-rationale
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summary: LIJ (Leaf Initiated Join), ATM Anycast, and Switched Virtual Path capabilities from SIG 4.0 are intentionally not discussed in this memo because models for their use in IP over ATM environments had not yet been defined at time of publication.
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section: "2"
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topics:
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- ip
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: design-rationale
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summary: Traffic parameters cannot be renegotiated after a call is active in SIG 4.0; negotiation is only possible during call establishment using the Minimum Acceptable or Alternative ATM Traffic Descriptor IEs, which is why IP entities should proactively negotiate PCR to link rate with a minimum of zero.
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section: 5.3.2
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: design-rationale
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summary: UBR is identified as the most natural ATM service category for best-effort IP because non-IIS IP has no notion of the performance requirements of the higher layers it supports; it therefore cannot provide a flexible, application-specific traffic signaling interface.
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section: 5.3.1
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: interoperability-note
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summary: In SIG 4.0, a SETUP or CONNECT message may include ONLY one of the Minimum Acceptable ATM Traffic Descriptor IE or the Alternative ATM Traffic Descriptor IE; including both in the same message is not permitted.
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section: 5.3.2
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: interoperability-note
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summary: Several traffic parameter combination entries in Appendix C are included for backward compatibility with UNI 3.1 and ITU-T Recommendations (Notes 4, 5, 10); with these conformance definitions the CLR commitment applies only to the CLP=0 traffic stream.
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section: Appendix C
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: interoperability-note
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summary: The QoS Parameter IE may be omitted from a SETUP message if and only if the Extended QoS Parameters IE is included; certain ATM service categories also permit use of the Extended QoS Parameters IE and End-to-End Transit Delay IE in place of the generic QoS Parameter IE.
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section: 5.3.4
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: normative-requirement
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summary: 'A SETUP message establishing an ATM connection for IP and multiprotocol interconnection MUST contain: AAL Parameters, ATM Traffic Descriptor, Broadband Bearer Capability, Broadband Low Layer Information, QoS Parameter, Called Party Number, and Calling Party Number IEs.'
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section: "4"
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rfc2119_level: MUST
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topics:
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- ip
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"
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document: rfc-2331
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kind: normative-requirement
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summary: A system implementing a Public ATM UNI interface serving as the called party of a VCC MUST NOT use an inactivity timer on such a VCC by default, to support layer 3 signalling protocols like RSVP where VCs correspond to reserved flows.
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section: "3.1"
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rfc2119_level: MUST NOT
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topics:
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- ip
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- qos
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-24"

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