2.7 OSPF IP FRR(快速重路由)

图片[1]-2.7 OSPF IP FRR(快速重路由)-大赛人网
图2-14  OSPF IP FRR(快速重路由)网络拓扑

 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
图2-15  OSPF IP FRR(快速重路由)直连网络故障网络拓扑
[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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