HP HPE FlexNetwork 7500 series Configuration Manual page 204

Table 15 Interface and IP address assignment
Device
Switch A
Switch C
Configuration procedure
1. Configure IP addresses and subnet masks for interfaces on the switches. (Details not shown.)
2. Configure IS-IS on the switches to make sure Switch A, Switch B, and Switch C can
communicate with each other at Layer 3. (Details not shown.)
3. Configure IS-IS FRR:
Enable IS-IS FRR to calculate a backup next hop through LFA calculation, or designate a
backup next hop by using a referenced routing policy.
(Method 1.) Enable IS-IS FRR to calculate a backup next hop through LFA calculation:

# Configure Switch A.
<SwitchA> system-view
[SwitchA] isis 1
[SwitchA-isis-1] address-family ipv4
[SwitchA-isis-1-ipv4] fast-reroute lfa
[SwitchA-isis-1-ipv4] quit
[SwitchA-isis-1] quit
# Configure Switch B.
<SwitchB> system-view
[SwitchB] isis 1
[SwitchB-isis-1] address-family ipv4
[SwitchB-isis-1-ipv4] fast-reroute lfa
[SwitchB-isis-1-ipv4] quit
[SwitchB-isis-1] quit
(Method 2.) Enable IS-IS FRR to designate a backup next hop by using a referenced 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
[SwitchA-route-policy-frr-10] apply fast-reroute backup-interface vlan-interface
100 backup-nexthop 12.12.12.2
[SwitchA-route-policy-frr-10] quit
[SwitchA] isis 1
[SwitchA-isis-1] address-family ipv4
[SwitchA-isis-1-ipv4] fast-reroute route-policy frr
[SwitchA-isis-1-ipv4] quit
[SwitchA-isis-1] quit
# Configure Switch B.
<SwitchB> system-view
Interface IP address
Vlan-int100 12.12.12.1/24
Vlan-int200 13.13.13.1/24
Loop0 1.1.1.1/32
Vlan-int100 12.12.12.2/24
Vlan-int101 24.24.24.2/24
Device Interface
Switch B Vlan-int101
Vlan-int200
Loop0
192
IP address
24.24.24.4/24
13.13.13.2/24
4.4.4.4/32