doc: Add L3 Multi-Homing with Backup Path HLD for IP Data Centers#2332
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This adds a High-Level Design document for EVPN L3 Multihoming backup tunnel support using IP Directed Control (IPDC) approach in SONiC. Signed-off-by: pbrisset <pbrisset@users.noreply.github.com>
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Summary
This HLD introduces Layer 3 Multi-Homing (L3MH) support with automatic backup path failover for IP-only data center deployments in SONiC. This feature enables EVPN-VXLAN multi-homing without requiring Layer 2 VNI (L2VNI) dependency, making it ideal for modern spine-leaf IP fabrics.
Key Features
Architecture Highlights
New Components:
vxlanmgr: Global L3VNI configuration managerfpmsyncd_nhg: Backup nexthop group managerneighsyncd_rt2: EVPN RT-2 remote neighbor synchronizationDatabase Schema:
VXLAN_GLOBALtable in CONFIG_DBBACKUP_NEXTHOP_GROUP_TABLEin APPL_DBNEIGH_TABLEwithrt2_typemetadataDummy VLAN/SVI: Uses a reserved VLAN (e.g., Vlan4094) as the decapsulation context for the global L3VNI
Use Case
Ideal for IP-only data centers where:
Compatibility
References