{
  "title": "交换机重启后组播视频消失，怎样记录 IGMP 恢复过程",
  "evidence_type": "synthetic-not-field-measurement",
  "date": "2026-10-23",
  "required_deliverable": "交换机型号配置、订阅变化和视频恢复的时间线",
  "fields": [
    "run",
    "elapsed_s",
    "event",
    "group",
    "member_port",
    "evidence"
  ],
  "sample_rows": [
    [
      "synthetic-1",
      3,
      "forwarding",
      "239.10.10.10",
      "port5",
      "switch-log"
    ],
    [
      "synthetic-1",
      7,
      "membership-report",
      "239.10.10.10",
      "port5",
      "capture"
    ],
    [
      "synthetic-1",
      8,
      "video-packet",
      "239.10.10.10",
      "port5",
      "capture"
    ],
    [
      "synthetic-1",
      12,
      "decoded-frame",
      "239.10.10.10",
      "port5",
      "video"
    ]
  ],
  "unmeasured": "未重启实体交换机，未产生真实订阅抓包或恢复录像；需要按协议现场采集。"
}