DCI / Multi-site HLD

[pbrisset]

VxLAN Data Center Interconnect (DCI) Multi-Site Support

Overview

This PR introduces the High-Level Design (HLD) for VxLAN Data Center Interconnect (DCI) functionality in SONiC, enabling seamless multi-site connectivity across geographically dispersed data centers using VxLAN EVPN technology.

Key Features

Multi-Site Architecture

• Normalized symmetric VNI approach across WAN interconnecting multiple data centers
• Domain-based separation of control plane and data plane
• Support for redundant Border Gateway (BGW) node pairs per site
• Site-ID based Ethernet Segment identification for multi-homing

Layer-2 Services

• Transparent Layer-2 extension across sites with normalized L2VNI
• Full VxLAN tunnel termination, lookup, and re-encapsulation at BGW nodes
• Ingress replication per domain for BUM traffic handling
• Support for both Anycast VTEP (VIP) and Physical VTEP (PIP) addressing

Layer-3 Services

• Asymmetric L3VNI routing support for inter-DC connectivity
• VRF-lite integration for northbound customer connectivity
• L3VNI tunnel termination with IPv4/IPv6 unicast routing

VM Mobility & Route Optimization

• Ingress Route Optimization (IRO) for seamless VM migration (vMotion)
• Global and local scope mobility with MAC/IP route re-origination
• Mobility sequence number handling across sites

Advanced Features

• BGP Route Target (RT) translation for ingress/egress traffic
• Implicit and explicit BGP route policy with summarization
• Support for locally connected hosts and orphan ports on BGW nodes
• EVPN multi-homing with DF/NDF election and local bias
• Per-tunnel traffic counters

[mssonicbld]

/azp run

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No pipelines are associated with this pull request.

[mssonicbld]

/azp run

[azure-pipelines]

No pipelines are associated with this pull request.