]> Huawei

Beiqing Road Beijing shengcheng@huawei.com

Huawei

Beiqing Road Beijing China shihang9@huawei.com

Futurewei

linda.dunbar@futurewei.com

Routing Inter-Domain Routing Multi-segment SD-WAN The document describes the control plane enhancement for multi-segment SD-WAN to exchange the corresponding GW information between edges.

Introduction To interconnect geographically faraway branches or SASE resources, multi-segment SD-WAN is often deployed via cloud backbone. As shown in , CPE 1 and CPE 2 are connected to the nearest Cloud GW in different regions. For the traffic from CPE 1 to CPE 2, the CPE 1 will encapsulate the address of the egress GW(GW3) and destination CPE(CPE2) in the dataplane(see ). To accomplish that, CPE needs to know their peers' corresponding GW addresses. This document proposes an control plane enhancement based on to exchange the corresponding GW address between CPEs.

Multi-segment SD-WAN

Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

Corresponding GW Sub-TLV Corresponding GW Sub-TLV within the Hybrid Underlay Tunnel UPDATE indicates the address of the corresponding GW. The following is the structure of the Corresponding GW Sub-TLV:

Security Considerations This document does not introduce any new security considerations.

IANA Considerations TBD.

Normative References Microsoft Futurewei Arista Microsoft The document describes the methods to optimize the stitching of multiple SD-WAN segments on transit nodes across Cloud DCs. Futurewei Hickory Hill Consulting Arrcus Microsoft Verizon Arista The document describes the encoding of BGP UPDATE messages for the SD-WAN edge node property discovery. 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 turns propagates the information to the intended peers that are authorized to communicate via the SD-WAN overlay network. In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.