HP MSR2000 series Configuration Manual page 106

In Figure 37, after you enable FRR on Router B, OSPF automatically calculates or designates a backup
next hop when a link failure is detected. Packets are directed to the backup next hop. At the same time,
OSPF calculates the shortest path based on the new network topology, and forwards packets over the
path after routing convergence.
You can either configure OSPF FRR to calculate a backup next hop automatically, or to designate a
backup next hop by using a routing policy.
Configuration prerequisites
Before you configure OSPF FRR, complete the following tasks:
Configure network layer addresses for interfaces.
•
Enable OSPF.
•
Configuration guidelines
Do not use FRR and BFD at the same time. Otherwise, FRR may fail to take effect.
•
Do not use the fast-reroute auto command together with the command vlink-peer.
•
Configuring OSPF FRR to automatically calculate a backup next hop
Step
1. Enter system view.
2. Configure the source address
of echo packets.
3. Enter OSPF view.
4. Enable OSPF FRR to
automatically calculate a
backup next hop.
Configuring OSPF FRR to designate a backup next hop with a routing policy
Before configuring this task, you need to use the apply fast-reroute backup-interface command to specify
a backup next hop in the routing policy to be referenced. For more information about the apply
fast-reroute backup-interface command and routing policy configuration, see
policies."
To configure OSPF FRR:
Step
Enter system view.
1.
2. Configure the source address
of echo packets.
3. Enter OSPF view.
4. Enable OSPF FRR to
designate a backup next hop
by using a routing policy.
Command
system-view
bfd echo-source-ip ip-address
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
fast-reroute auto [ abr-only ]
Command
system-view
bfd echo-source-ip ip-address
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
fast-reroute route-policy
route-policy-name
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Remarks
N/A
Not configured by default.
N/A
Not configured by default.
If abr-only is specified, the route to the
ABR is selected as the backup path.
"Configuring routing
Remarks
N/A
Not configured by default.
N/A
Not configured by default.