msr-3600s做双网热备,但是不能自动切换。
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MSR3600系列路由器做双网热备无法自动切换,最常见的原因是:虽然配置了两条默认路由,但没有配置链路检测机制(如NQA联动Track),或者配置了但Track检测状态没有正确联动路由。
你的描述很关键:“联通出问题了,没有外网,然后所有网没有自动切换”。根据H3C设备的运行机制,出现这种情况通常有以下几种可能:
| 可能原因 | 说明 | 排查方法 |
|---|---|---|
| 链路检测机制缺失 | 只配置了两条静态路由,但未配置NQA/BFD检测,设备认为物理接口UP就是正常,不会自动切换 | 检查是否配置了track和nqa |
| Track联动未生效 | 配置了NQA但Track状态变化没有触发路由切换 | display track 查看状态 |
| 路由优先级配置问题 | 两条路由优先级相同,形成了负载分担而不是主备 | display ip routing-table 查看 |
| 接口物理状态问题 | 联通线路接口没有down,但运营商侧已经断网 | display interface 查看 |
| RBM热备配置问题 | 如果是两台设备做热备,可能主备设备配置未同步 | display remote-backup-group status |
登录到MSR3600路由器,执行以下命令检查当前状态:
这是最常用、最稳定的双出口主备切换方案。核心思路:通过NQA持续检测主链路(联通)的连通性,一旦检测失败,自动撤销主路由,让备用路由(电信)生效。
完整配置步骤:
如果你有两台MSR3600做热备(一台主用一台备用),需要使用RBM(Remote Backup Management)功能。
但需要注意:根据H3C官方资料,MSR3600系列不是所有型号都支持RBM热备:
| 型号 | RBM支持情况 |
|---|---|
| MSR3600-28, MSR3600-51 | 不支持 |
| MSR3600-28-SI, MSR3600-51-SI | 不支持 |
| MSR3600-28-X1, MSR3600-51-X1 | 不支持 |
| MSR3600-28-G-DP, MSR3600-51-G-DP | 不支持 |
| MSR3610, MSR3620, MSR3640, MSR3660 | 支持 |
如果你的设备支持RBM,可以参考以下配置要点:
配置是否自动同步成功:display remote-backup-group sync-check
主备状态是否正确:display remote-backup-group status
是否配置了路由开销调整:adjust-cost ospf enable absolute 60000
根据你描述的“一条联通、一条电信”的场景:
如果你只有一台MSR3600 → 使用方案一(NQA联动Track)
如果你有两台MSR3600做热备 → 先确认设备型号是否支持RBM,如果支持则用方案二
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