![图片[1]-2.7 OSPF IP FRR(快速重路由)-大赛人网](https://www.dsrw.com/wp-content/uploads/2023/03/图片6-25-1024x440.png)
动态的IP FRR,利用LFA(loop-Free Alternates)算法预先计算出备份路径,保存在转发表中,以备在故障时将流量快速切换到备份链路上,保证流量不中断,从而达到流量保护的目的,该功能可将故障恢复时间降低到50ms
1.R1配置IP FRR
[R1]ospf 1
[R1-ospf-1]frr
[R1-ospf-1-frr]loop-free-alternate
//利用LFA算法备份下一跳和备份出接口
[R1]display ip routing-table 4.4.4.4 verbose
Route Flags: R - relay, D - download to fib
Routing Table : Public
Summary Count : 1
Destination: 4.4.4.4/32
Protocol: OSPF Process ID: 1
Preference: 10 Cost: 1
NextHop: 14.1.1.4 Neighbour: 0.0.0.0
State: Active Adv Age: 00h01m13s
Tag: 0 Priority: medium
Label: NULL QoSInfo: 0x0
IndirectID: 0x0
RelayNextHop: 0.0.0.0 Interface: GigabitEthernet0/0/1
TunnelID: 0x0 Flags: D
BkNextHop: 12.1.1.2 BkInterface: GigabitEthernet0/0/0
BkLabel: NULL SecTunnelID: 0x0
BkPETunnelID: 0x0 BkPESecTunnelID: 0x0
BkIndirectID: 0x0
2.R1长pingR4
[R1]ping -c 1000 -r 4.4.4.4
PING 4.4.4.4: 56 data bytes, press CTRL_C to break
Reply from 4.4.4.4: bytes=56 Sequence=1 ttl=255 time=20 ms
Record Route:
4.4.4.4
14.1.1.1
3.断开R4的G0/0/1端口,下一跳直接切换到12.1.1.2,且无丢包现象,观察R1路由信息
![图片[2]-2.7 OSPF IP FRR(快速重路由)-大赛人网](https://www.dsrw.com/wp-content/uploads/2023/03/图片7-23-1024x464.png)
[R4]interface GigabitEthernet 0/0/1
[R4-GigabitEthernet0/0/1]shutdown
4.R1长pingR4
Reply from 4.4.4.4: bytes=56 Sequence=8 ttl=254 time=30 ms
Record Route:
24.1.1.2
4.4.4.4
12.1.1.2
12.1.1.1
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