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doc: Add FRR L3MH backup tunnel IPDC HLD#2331

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doc: Add FRR L3MH backup tunnel IPDC HLD#2331
pbrisset wants to merge 1 commit into
sonic-net:masterfrom
pbrisset:frr-l3mh-hld-ipdc

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@pbrisset
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Add High Level Design document for FRR implementation of EVPN-VXLAN L3 Multihoming with backup tunnel support for IP Data Centers.

Key features:

  • RT-4 (Ethernet Segment routes) for multi-homing PE discovery
  • RT-2 (MAC/IP routes with Label-1=0) for neighbor synchronization
  • Global L3VNI operation in default routing table (no VRF)
  • Backup nexthop group creation and management
  • All-active L3 multi-homing without DF election
  • Integration with SONiC FPM protocol

This complements the SONiC HLD (SONIC-L3MH-backup-tunnel-IPDC.md).

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/azp run

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Add High Level Design document for FRR implementation of EVPN-VXLAN L3 Multihoming with backup tunnel support for IP Data Centers.

Key features:
- RT-4 (Ethernet Segment routes) for multi-homing PE discovery
- RT-2 (MAC/IP routes with Label-1=0) for neighbor synchronization
- Global L3VNI operation in default routing table (no VRF)
- Backup nexthop group creation and management
- All-active L3 multi-homing without DF election
- Integration with SONiC FPM protocol

This complements the SONiC HLD (SONIC-L3MH-backup-tunnel-IPDC.md).

Signed-off-by: Patrice Brissette <patricebrissette@gmail.com>
@pbrisset pbrisset force-pushed the frr-l3mh-hld-ipdc branch from 8c38e82 to 729c542 Compare May 13, 2026 19:56
@mssonicbld
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/azp run

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No pipelines are associated with this pull request.

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2 participants