Configuration Prerequisites; Configuration Guidelines; Configuration Procedure - HP FlexFabric 12900E Series Configuration Manual

Figure 95 Network diagram for OSPFv3 FRR
Router A
As shown in
next hop or specifies a backup next hop by using a routing policy. When the primary link fails,
OSPFv3 directs packets to the backup next hop. At the same time, OSPFv3 calculates the shortest
path based on the new network topology. It forwards packets over the path after network
convergence.
You can configure OSPFv3 FRR to calculate a backup next hop by using the loop free alternate (LFA)
algorithm, or specify a backup next hop by using a routing policy.

Configuration prerequisites

Before you configure OSPFv3 FRR, perform the following tasks:
•
Configure IPv6 addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
Enable OSPFv3.
•
Make sure the backup next hop is reachable.

Configuration guidelines

Do not use the fast-reroute lfa command together with the vlink-peer command.

Configuration procedure

Configuring OSPFv3 FRR to calculate a backup next hop using the LFA algorithm
Step
1. Enter system view.
2. Enter interface view.
3. (Optional.) Disable LFA on
an interface.
4. Return to system view.
5. Enter OSPFv3 view.
6. Enable OSPFv3 FRR to
calculate a backup next hop
by using the LFA algorithm.
Backup nexthop: Router C
Router B
Figure 95, configure FRR on Router B. OSPFv3 FRR automatically calculates a backup
Command
system-view
interface
interface-number
ospfv3
lfa-backup exclude
quit
ospfv3
vpn-instance
vpn-instance-name ] *
fast-reroute lfa [ abr-only ]
Nexthop: Router D Router E
interface-type
fast-reroute
[ process-id |
419
Remarks
N/A
N/A
By default, the interface on which LFA
is enabled can be selected as a
backup interface.
N/A
N/A
By default, OSPFv3 FRR is disabled.
If abr-only is specified, the route to the
ABR is selected as the backup path.