从日志看19:13:19分端口UP，但是到19:39:26端口才被选中。
%Jun 1 19:13:19:753 2026 H3C IFNET/3/PHY_UPDOWN: Physical state on the interface Twenty-FiveGigE1/0/15 changed to up.
……
%Jun 1 19:39:26:402 2026 H3C LAGG/6/LAGG_ACTIVE: Member port WGE1/0/15 of aggregation group BAGG15 changed to the active state.
%Jun 1 19:39:26:404 2026 H3C IFNET/5/LINK_UPDOWN: Line protocol state on the interface Twenty-FiveGigE1/0/15 changed to up.
从LACP报文的收发看，19:13:19插入的光模块后1/0/15口UP，但是一直没有收到lacp，到19:39:24才收到第一个lacp报文，19:39:26协商完成。
[H3C-probe]display system internal link-aggregation lacp packet interface Twenty-FiveGigE 1/0/15
Aggregate interface: Bridge-Aggregation15
Data and Time: 06/01 19:39:26.650 ///协商完成
Packet description:
Local: SystemID=65535 SystemMAC=b8ce-f6c2-3fa0 Key=21 Index=1 Priority=255 Flag=63
Remote: SystemID=32768 SystemMAC=6001-0000-0002 Key=40015 Index=16404 Priority=32768 Flag=61
Data and Time: 06/01 19:39:26.372
Packet description:
Local: SystemID=65535 SystemMAC=b8ce-f6c2-3fa0 Key=21 Index=1 Priority=255 Flag=15
Remote: SystemID=32768 SystemMAC=6001-0000-0002 Key=40015 Index=16404 Priority=32768 Flag=13
Data and Time: 06/01 19:39:24.249 ///此次故障第一次收到LACP报文
Packet description:
Local: SystemID=65535 SystemMAC=b8ce-f6c2-3fa0 Key=21 Index=1 Priority=255 Flag=199
Remote: SystemID=65535 SystemMAC=0000-0000-0000 Key=1 Index=1 Priority=255 Flag=3
Data and Time: 10/19 15:50:18.505 //上一次LACP报文有变化
Packet description:
Local: SystemID=65535 SystemMAC=b8ce-f6c2-3fa0 Key=21 Index=1 Priority=255 Flag=63
Remote: SystemID=32768 SystemMAC=6001-0000-0002 Key=40015 Index=16404 Priority=32768 Flag=61
Data and Time: 10/19 15:50:18.205
Packet description:
Local: SystemID=65535 SystemMAC=b8ce-f6c2-3fa0 Key=21 Index=1 Priority=255 Flag=15
Remote: SystemID=32768 SystemMAC=6001-0000-0002 Key=40015 Index=16404 Priority=32768 Flag=13
综上，故障时1/0/15端口收不到LACP报文，导致端口无法选中
建议排查下对端是否有异常。后续如有故障，建议故障时采集display link-aggregation verbose，对比查看哪些信息有异常，如mac、优先级、操作key、状态标志等信息。