Session Date/Time: 06 Nov 2023 12:00

dmm

Summary

The DMM meeting at IETF 118 covered working group status updates, discussion of existing drafts, and presentations on mobility-aware transport network slicing for 5G and computing-aware traffic steering for mobile user planes. A new proposal on SRH reduction for SRv6-based MAP was also presented. The focus was on the technical details of the drafts and their potential impact on existing protocols and architectures.

Key Discussion Points

Impact Analysis from IPv6 DTPU Checksum Calculation: The chair requested feedback on the impact analysis document, particularly regarding the inclusion of current deployment status and impacts on UDP checksum.
Anup Scope and CGP Liaison: Discussed comments from the working group last call on the Anup draft, particularly regarding its scope, convergence with CGP, and handling of mobility handover.
Mobility-Aware Transport Network Slicing for 5G:
- Clarification was provided on whether the slicing applies to the control plane, data plane, or both. The draft was updated to clarify it applies to connecting control plane functionalities.
- Discussion around the applicability of transport engineering in the front haul network and the role of UPF.
- The existence of PBR (Policy-Based Routing) in the draft was questioned, with the conclusion that references to the underlay should be minimized.
- The use of UDP source port for sales and marketing and whether it can be implemented for slice and marketing.
- Whether the method can be applied to control plane slices.
- If Private networks are considered.
Computing-Aware Traffic Steering for Mobile User Planes:
- Concerns were raised about potential conflicts with 3GPP procedures and the practicality of influencing compute based on 3GPP signals
- Impact of the proposed architecture on the 5G control plane was discussed.
- Questioned about how traffic engineer for any reason.
- Interactions with 5GC and the complexity of the PDU session setup process.
- Service Content Instance (SCI) optimization and its relevance to DMM.
- Underlying network assumptions, specifically the reliance on SRv6.
- Requested more details on advertisement
- Relationships with SRv6 were discussed.
- Using the any cost address as a service address
- PD session created for multi services.
SRH Reduction for SRv6-Based MAP:
- A proposal for reducing SRH overhead in SRv6-based MAP by using a single SID to store both IPv6 address and GTP-U header information was presented.
- Questioned if Separating the destination address is more efficient.
- Concerns about the lack of standardization for Micro-SID.
- Differentiation between SRv6 and IPv6 and security concerns.
- compromise between the space and the processing.
- Longer prefix fed and what protocol does it use to send it?

Decisions and Action Items

Anup Draft: Chairs will talk with the AD about the working group last call for the Anup draft.
Mobility-Aware Transport Network Slicing for 5G:
- Authors to review and remove PBR from the draft, focusing on the mapping between 3GPP and transport domains.
- Authors to review if more details on maintaining entropy are needed and the suggestion of more feedback.
- Authors need review from transport expert.
- The author is to look at private networks for the draft.
Computing-Aware Traffic Steering for Mobile User Planes:
- Authors to consider comment questions about how traffic engineer for any reason.
- Authors to consider 5GC in the next
- Author needs to review if the document is in the series of cat's documents
- Author needs to consider assumptions on the transport networks.
SRH Reduction for SRv6-Based MAP:
- Authors to consider suggestion about compromise between the space and the processing.

Next Steps

Authors to revise drafts based on feedback received during the meeting and on the mailing list.
Continue discussion on the mailing lists for the documents under consideration.
Further discussion on Anup pending chairs' discussion with the AD.