HP FlexFabric 12900E Series Configuration Manual page 475

Figure 109 Network diagram
Loop0
Switch A
Table 28 Interface and IP address assignment
Device
Switch A
Switch C
Configuration procedure
1. Configure IPv6 addresses for interfaces on the switches and enable IPv6 IS-IS. (Details not
shown.)
2. Configure IPv6 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 IPv6 IS-IS FRR:
Enable IPv6 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 IPv6 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 ipv6
[SwitchA-isis-1-ipv6] fast-reroute lfa
# Configure Switch B.
<SwitchB> system-view
[SwitchB] isis 1
[SwitchB-isis-1] address-family ipv6
[SwitchB-isis-1-ipv6] fast-reroute lfa
(Method 2.) Enable IPv6 IS-IS FRR to designate a backup next hop by using a routing

policy:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ipv6 prefix-list abc index 10 permit 20:: 128
[SwitchA] route-policy frr permit node 10
[SwitchA-route-policy-frr-10] if-match ipv6 address prefix-list abc
[SwitchA-route-policy-frr-10] apply ipv6 fast-reroute backup-interface
vlan-interface 100 backup-nexthop 1::2
Switch C
Link B
Link A
Vlan-int200
Interface IP address
Vlan-int100 1::1/64
Vlan-int200 2::1/64
Loop0 10::1/128
Vlan-int100 1::2/64
Vlan-int101 3::2/64
Vlan-int200
Switch B
Device
Switch B
463
Loop0
Interface IP address
Vlan-int101 3::1/64
Vlan-int200 2::2/64
Loop0 20::1/128