1233.1.1.0/24 O_ASE 150 1 10.2.1.2 Vlan2003.1.2.0/24 O_ASE 150 1 10.2.1.2 Vlan20010.1.1.0/24 Direct 0 0 10.1.1.1 Vlan10010.1.1.1/32 Direct 0 0 127.0.0.1 InLoop010.2.1.0/24 Direct 0 0 10.2.1.1 Vlan20010.2.1.1/32 Direct 0 0 127.0.0.1 InLoop010.3.1.0/24 OSPF 10 4 10.1.1.2 Vlan10010.4.1.0/24 OSPF 10 13 10.2.1.2 Vlan200127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0The route destined for 10.5.1.1/24 is filtered out.Configuring OSPF FRRNetwork requirementsSwitch S, Switch A, and Switch D belong to the same OSPF domain as illustrated in Figure 47. ConfigureOSPF FRR so that when the link between Switch S and Switch D fails, traffic can be switched to Link Bimmediately.Figure 47 Network diagramSwitch S Switch DSwitch ALoop 01.1.1.1/32Vlan-int10012.12.12.1/24Vlan-int20013.13.13.1/24Vlan-int20013.13.13.2/24Vlan-int10012.12.12.2/24Vlan-int10124.24.24.2/24Vlan-int10124.24.24.4/24Loop 04.4.4.4/32Link ALink BConfiguration procedure1. Configure IP addresses for the interfaces on each switch and configure OSPF.Follow Figure 47 to configure the IP address and subnet mask of each interface on the switches. (Detailsnot shown)Configure OSPF on the switches, ensuring that Switch S, Switch A, and Switch D can communicate witheach other at Layer 3. (Details not shown)2. Configure OSPF FRR.You can enable OSPF FRR to either automatically calculate a backup next hop, or to designate a backupnext hop by using a routing policy.Method I: Enable OSPF FRR to automatically calculate the backup next hop.# Configure Switch S. system-view[SwitchS] bfd echo-source-ip 1.1.1.1[SwitchS] ospf 1[SwitchS-ospf-1] fast-reroute auto[SwitchS-ospf-1] quit
