cluster集群创建问题

[airdive]

cluster集群属性配置：
cluster: # 集群配置
enable: ${CLUSTER_ENABLE:true} # 集群开关
url: ${CLUSTER_URL:192.168.26.123:7771,192.168.26.124:7771,192.168.25.100:7771} # 启动节点
port: ${CLUSTER_PORT:7771} # 端口 7772
node: ${CLUSTER_NODE:node-1} # 集群节点名称 唯一，123：node-2，124：node-3
namespace: ${CLUSTER_NAMESPACE:topband} # 集群空间,需要一致才能通信
集群以docker方式启动（--net host）,192.168.25.100为本机节点IP，DEBUG日志可以看到与123、124建立了连接：
DEBUG r.n.resources.NewConnectionProvider - [id:43e77142, L:/192.168.25.100:55297 - R:/192.168.26.123:7771] Connected new channel
DEBUG r.n.resources.NewConnectionProvider - [id:43e77142, L:/192.168.25.100:55297 - R:/192.168.26.123:7771] onStateChange([connected], SimpleConnection{channel=[id: 0x43e77142, L:/192.168.25.100:55297 - R:/192.168.26.123:7771]})
DEBUG r.n.resources.NewConnectionProvider - [id:43e77142, L:/192.168.25.100:55297 - R:/192.168.26.123:7771] onStateChange([configured], ChannelOperations{SimpleConnection{channel=[id: 0x43e77142, L:/192.168.25.100:55297 - R:/192.168.26.123:7771]}})
DEBUG r.n.resources.NewConnectionProvider - [id:46eb97b2, L:/192.168.25.100:55298 - R:/192.168.26.124:7771] Connected new channel
DEBUG r.n.resources.NewConnectionProvider - [id:46eb97b2, L:/192.168.25.100:55298 - R:/192.168.26.124:7771] onStateChange([connected], SimpleConnection{channel=[id: 0x46eb97b2, L:/192.168.25.100:55298 - R:/192.168.26.124:7771]})
DEBUG r.n.resources.NewConnectionProvider - [id:46eb97b2, L:/192.168.25.100:55298 - R:/192.168.26.124:7771] onStateChange([configured], ChannelOperations{SimpleConnection{channel=[id: 0x46eb97b2, L:/192.168.25.100:55298 - R:/192.168.26.124:7771]}})

本地机器ScubeClusterRegistry类的spreadMessage()方法向集群传播消息时，打印cluster.otherMembers()：
INFO i.g.q.registry.ScubeClusterRegistry - cluster: [topband:1eb8d9d4-ffde-4942-bc91-f133e2770cae@192.168.26.123:7771]
而124机器上打印cluster.otherMembers()：[]，为空
请问这是怎么回事？