RFC 文档RFC 7752 - North-Bound Distribution of Link-State and Traffic Engineering (TE) Information Using BGP1.1. 要求语言本页总览1.1. Requirements Language (要求语言)1.1. Requirements Language (要求语言) 本文档中的关键词 "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", 和 "OPTIONAL" 应按 RFC 2119 [RFC2119] 中所述进行解释。