RFC 文档RFC 8210 - The Resource Public Key Infrastructure (RPKI) to Router Protocol, Version 18. 协议序列本页总览8. Protocol Sequences (协议序列)8. Protocol Sequences (协议序列) PDU 传输序列分为以下四种会话: 8.1 Start or Restart (启动或重启) 8.2 Typical Exchange (典型交换) 8.3 No Incremental Update Available (无增量更新可用) 8.4 Cache Has No Data Available (缓存无数据可用)