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You can enable OSPF FRR to either calculate a backup next hop by using the LFA algorithm, or
specify a backup next hop by using a routing policy.
(Method 1.) Enable OSPF FRR to calculate the backup next hop by using the LFA algorithm:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ospf 1
[SwitchA-ospf-1] fast-reroute lfa
[SwitchA-ospf-1] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] ospf 1
[SwitchB-ospf-1] fast-reroute lfa
[SwitchB-ospf-1] quit
(Method 2.) Enable OSPF FRR to designate a backup next hop by using a routing policy.
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ip prefix-list abc index 10 permit 4.4.4.4 32
[SwitchA] route-policy frr permit node 10
[SwitchA-route-policy-frr-10] if-match ip address prefix-list abc
[SwitchA-route-policy-frr-10] apply fast-reroute backup-interface vlan-interface
100 backup-nexthop 12.12.12.2
[SwitchA-route-policy-frr-10] quit
[SwitchA] ospf 1
[SwitchA-ospf-1] fast-reroute route-policy frr
[SwitchA-ospf-1] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] ip prefix-list abc index 10 permit 1.1.1.1 32
[SwitchB] route-policy frr permit node 10
[SwitchB-route-policy-frr-10] if-match ip address prefix-list abc
[SwitchB-route-policy-frr-10] apply fast-reroute backup-interface vlan-interface
101 backup-nexthop 24.24.24.2
[SwitchB-route-policy-frr-10] quit
[SwitchB] ospf 1
[SwitchB-ospf-1] fast-reroute route-policy frr
[SwitchB-ospf-1] quit
Verifying the configuration
# Display route 4.4.4.4/32 on Switch A to view the backup next hop information.
[SwitchA] display ip routing-table 4.4.4.4 verbose
Summary Count : 1
Destination: 4.4.4.4/32
Protocol: O_INTRA
Process ID:
1
SubProtID: 0x1 Age: 04h20m37s
Cost: 1 Preference: 10
IpPre: N/A QosLocalID: N/A
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