怎么做双出口的静态路由加BFD，核心配置？
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问题描述：
怎么做双出口的静态路由加BFD，核心配置？
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核心配置步骤
1. 划分主备路径
主路径静态路由（高优先级，默认60）
ip route-static 0.0.0.0 0 <主出口下一跳> [接口名] bfd control-packet
备份路径静态路由（低优先级，如65）
ip route-static 0.0.0.0 0 <备份出口下一跳> [接口名] preference 65
2. 配置BFD参数（直连场景）
全局启用BFD
bfd
在出接口配置BFD检测参数
interface <主出口接口名>
bfd min-transmit-interval 500 发送间隔(ms)
bfd min-receive-interval 500 接收间隔(ms)
bfd detect-multiplier 9 检测倍数
3. 非直连场景特殊配置
需指定源IP（非直连时必需）
ip route-static 0.0.0.0 0 <非直连下一跳> bfd control-packet bfd-source <本端IP>
配置案例（双出口主备切换）
主路径配置（出口1）
ip route-static 0.0.0.0 0 202.100.1.1 GigabitEthernet0/1 bfd control-packet
ip route-static 0.0.0.0 0 202.100.2.1 GigabitEthernet0/2 preference 65
BFD参数优化（GE0/1接口）
interface GigabitEthernet0/1
bfd min-transmit-interval 500
bfd min-receive-interval 500
bfd detect-multiplier 7 500ms × 7 = 3.5秒故障检测
关键验证命令
display bfd session 查看BFD会话状态（需为Up）
display ip routing-table 验证主路径激活（Proto=Static Pref=60）
ping -a <bfd-source-ip> <对端IP> 测试BFD可达性
注意事项
1. 直连检测：BFD control-packet模式要求两端设备均支持BFD
2. 非直连场景：
必须配置bfd-source（建议用Loopback地址）
确保源IP到对端有可达路由
3. 切换时间：调整detect-multiplier可优化故障检测速度（默认5秒）
故障场景：当主路径BFD检测失败时，路由自动切换至备份路径（Pref=65），收敛时间<1秒。恢复后自动回切。
完整配置指南参考：[H3C静态路由与BFD联动官方文档](https://www.h3c.com/cn/d_202401/2020400_30005_0.htm_Toc155620877)
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