Abstract
This disclosure describes a control-plane assisted framework for unified Operations, Administration, and Maintenance (OAM) across heterogeneous Layer-2 VPN domains, including L2VPN and EVPN interconnected via an interworking Provider Edge (PE). The interworking PE advertises cross-domain service extension and unified OAM capability using new signaling constructs, including an EVPN Extended Community and an LDP OAM Interworking TLV with an associated Status Code, enabling end PEs to recognize multi-domain services without requiring protocol convergence. The framework supports dual OAM modes, including end-to-end service validation and domain-specific diagnostics. For full-service OAM, the interworking PE performs probe translation, fan-out to multiple remote endpoints, and correlation using a shared identifier, while suppressing duplicate responses by returning a single deterministic reply. The approach is backward compatible and improves fault isolation, eliminates ambiguity at interworking boundaries, and enables consistent end-to-end service assurance across hybrid VPN deployments.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "Unified OAM Interworking Across EVPN and L2VPN Domains", Technical Disclosure Commons, (April 01, 2026)
https://www.tdcommons.org/dpubs_series/9676