本标准描述了实现DOCSIS第二层虚拟专用网络（DOCSIS L2VPN）功能对CMTSs和CMs的要求。 L2VPN功能允许有线电视运营商向商业企业提供第二层透明局域网服务（TLS），这是DOCSIS商业服务（BSoD）计划的主要目标之一。 为了加快上市时间，[L2VPN-DG]向CMTS制造商提供了关于如何分阶段实施本标准中定义的要求的指南。阶段名称仅适用于CMTS产品。有线调制解调器预计将支持第一阶段所需的所有L2VPN功能。 本文件与CableLabs CM相对应，且在技术上等同于CableLabs CM- SP-L2VPN-I15-150528[L2VPN-IP]。

This standard describes requirements on both CMTSs and CMs in order to implement a DOCSIS Layer-2 Virtual Private Network (DOCSIS L2VPN) feature. The L2VPN feature allows cable operators to offer a Layer 2 Transparent LAN Service (TLS) to commercial enterprises, which is one of the principal goals of the Business Services over DOCSIS (BSoD) initiative. In order to speed time to market, [L2VPN-DG] offers guidelines to CMTS manufacturers as to how to phase the implementation of requirements defined in this standard. Phase designations are only applicable to CMTS products. Cable modems are expected to support all required L2VPN features in Phase 1. The present document corresponds to and is the technical equivalent of the CableLabs CM-SP-L2VPN-I15-150528 [L2VPN-IP].