HP FlexFabric 12900E Series Configuration Manual page 456

You can enable OSPFv3 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 OSPFv3 FRR to calculate the backup next hop by using the LFA

algorithm:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ospfv3 1
[SwitchA-ospfv3-1] fast-reroute lfa
[SwitchA-ospfv3-1] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] ospfv3 1
[SwitchB-ospfv3-1] fast-reroute lfa
[SwitchB-ospfv3-1] quit
(Method 2.) Enable OSPFv3 FRR to designate a backup next hop by using a routing policy:

# Configure Switch A.
<SwitchA> system-view
[SwitchA] ipv6 prefix-list abc index 10 permit 10:: 128
[SwitchA] route-policy frr permit node 10
[SwitchA-route-policy-frr-10] if-match ipv6 address prefix-list abc
[SwitchA-route-policy-frr-10] apply ipv6 fast-reroute backup-interface
vlan-interface 100 backup-nexthop 1::2/64
[SwitchA-route-policy-frr-10] quit
[SwitchA] ospfv3 1
[SwitchA-ospfv3-1] fast-reroute route-policy frr
[SwitchA-ospfv3-1] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] ipv6 prefix-list abc index 10 permit 20:: 128
[SwitchB] route-policy frr permit node 10
[SwitchB-route-policy-frr-10] if-match ipv6 address prefix-list abc
[SwitchB-route-policy-frr-10] apply ipv6 fast-reroute backup-interface
vlan-interface 101 backup-nexthop 3::2/64
[SwitchB-route-policy-frr-10] quit
[SwitchB] ospfv3 1
[SwitchB-ospfv3-1] fast-reroute route-policy frr
[SwitchB-ospfv3-1] quit
Verifying the configuration
# Display the route 20::1/128 on Switch A to view the backup next hop information.
[SwitchA] display ipv6 routing-table 20::1 128 verbose
Summary count : 1
Destination: 20::1/128
Protocol: O_INTRA
Process ID: 1
SubProtID: 0x1
Cost: 6
Age: 00h03m45s
Preference: 10
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