Liaison statement
Liaison Statement from the IETF Routing Area to Mplify on SD-WAN Related Work

Dear Mplify colleagues,

On behalf of the IETF Routing Area, we would like to inform you that several
SD-WAN related documents have been adopted as Working Group drafts within the
IETF. This liaison is provided for information and to invite your review and
feedback, with the objective of ensuring that Mplify considerations are taken
into account in the ongoing work.

draft-ietf-bess-bgp-sdwan-usage (Now under WG last call in BESS WG -
bess@ietf.org)

Abstract: This document explores the complexities involved in managing large
scale Software Defined WAN (SD-WAN) overlay networks, along with various SD-WAN
scenarios. Its objective is to illustrate how a BGP-based control plane can
effectively manage these overlay networks by distributing edge service
reachability information, WAN port attributes, and underlay path details,
thereby minimizing manual provisioning.

draft-ietf-idr-sdwan-edge-discovery (WG document in IDR WG - idr@ietf.org)

Abstract: The document describes the BGP mechanisms for SD-WAN (Software
Defined Wide Area Network) edge node attribute discovery.  These mechanisms
include a new tunnel type and sub-TLVs for the BGP Tunnel-Encapsulation
Attribute [RFC9012] and set of NLRI (network layer reachability information)
for SD-WAN underlay information. In the context of this document, BGP Route
Reflector (RR) is the component of the SD-WAN Controller that receives the BGP
UPDATE from SD-WAN edges and in turn propagates the information to the intended
peers that are authorized to communicate via the SD-WAN overlay network.

draft-ietf-rtgwg-multisegment-sdwan (WG document in RTGWG WG - rtgwg@ietf.org)

Abstract: This document describes a method for seamlessly interconnecting
geographically separated SD-WAN segments via  a Cloud Backbone without
requiring Cloud Gateways (GWs) to  decrypt and re-encrypt traffic. By
encapsulating IPsec-encrypted payloads within GENEVE headers (RFC 8926), the
approach enables Cloud GWs to forward encrypted traffic directly between
distant Customer Premises Equipment (CPEs). This reduces processing overhead,
improves scalability, and preserves the confidentiality of enterprise data
while ensuring secure and efficient multi-segment SD-WAN connectivity.

Feedback from Mplify would be valuable to ensure broad applicability and
alignment across industry activities. In particular, timely input during the
Working Group Last Calls and subsequent IETF Last Calls is especially
important, as it ensures that comments can be fully considered and incorporated
before the documents advance further in the publication process.

We invite Mplify participants to review these documents and provide comments on
the relevant WG mailing lists as indicated against each of the documents.
Participation in IETF mailing lists is open, and we welcome your input.

Sincerely,
Gunter Van de Velde
Ketan Talaulikar
Jim Guichard
IETF Routing Area Directors