HP HPE FlexNetwork 7500 series Configuration Manual page 143

Figure 34 Network diagram
Loop0
Switch A
Table 10 Interface and IP address assignment
Device
Switch A
Switch A
Switch A
Switch B
Switch B
Switch B
Switch C
Switch C
Configuration procedure
1. Configure IP addresses and subnet masks for interfaces on the switches. (Details not shown.)
2. Configure OSPF on the switches to ensure that Switch A, Switch B, and Switch C can
communicate with each other at the network layer. (Details not shown.)
3. Configure OSPF FRR to automatically calculate the backup next hop:
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
Switch C
Link B
Link A
Vlan-int200
Interface
Vlan-int100
Vlan-int200
Loop0
Vlan-int101
Vlan-int200
Loop0
Vlan-int100
Vlan-int101
Vlan-int200
Switch B
131
Loop0
IP address
12.12.12.1/24
13.13.13.1/24
1.1.1.1/32
24.24.24.4/24
13.13.13.2/24
4.4.4.4/32
12.12.12.2/24
24.24.24.2/24