HP 3600 v2 series Configuration Manual page 106

Figure 37 Network diagram for OSPF FRR
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 configuring OSPF FRR, complete the following tasks:
Configure network layer addresses for interfaces
•
Enable OSPF
•
Configure OSPF FRR to automatically calculate a backup next hop
Follow these steps to configure automatic OSPF FRR:
To do...
Enter system view
Configure the source address of
echo packets
Enter OSPF view
Enable OSPF FRR to automatically
calculate a backup next hop
Configure 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 the chapter "Routing
policy configuration."
Follow these steps to configure OSPF FRR:
To do...
Enter system view
Configure the source address of
echo packets
Use the 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 ]
Use the command...
system-view
bfd echo-source-ip ip-address
94
Remarks
—
Required
Not configured by default.
—
Required
Not configured by default.
If abr-only is specified, the route to the
ABR is selected as the backup path.
Remarks
—
Required
Not configured by default.