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# Configure Switch C to establish an EBGP session to Switch A, and an IBGP session to Switch
D.
<SwitchC> system-view
[SwitchC] bgp 200
[SwitchC] router-id 3.3.3.3
[SwitchC-bgp-default] peer 2001::1 as-number 100
[SwitchC-bgp-default] peer 2002::2 as-number 200
[SwitchC-bgp-default] address-family ipv6 unicast
[SwitchC-bgp-default-ipv6] peer 2001::1 enable
[SwitchC-bgp-default-ipv6] peer 2002::2 enable
[SwitchC-bgp-default-ipv6] peer 2002::2 next-hop-local
[SwitchC-bgp-default-ipv6] quit
[SwitchC-bgp-default] quit
# Configure Switch D to establish IBGP sessions to Switch B and Switch C, and advertise
network 4::/64.
<SwitchD> system-view
[SwitchD] bgp 200
[SwitchD-bgp-default] peer 3002::1 as-number 200
[SwitchD-bgp-default] peer 2002::1 as-number 200
[SwitchD-bgp-default] address-family ipv6 unicast
[SwitchD-bgp-default-ipv6] peer 3002::1 enable
[SwitchD-bgp-default-ipv6] peer 2002::1 enable
[SwitchD-bgp-default-ipv6] network 4:: 64
[SwitchD-bgp-default-ipv6] quit
[SwitchD-bgp-default] quit
4. Configure preferred values so Link B is used to forward traffic between Switch A and Switch D:
# Configure Switch A to set the preferred value to 100 for routes received from Switch B.
[SwitchA-bgp-default-ipv6] peer 3001::2 preferred-value 100
[SwitchA-bgp-default-ipv6] quit
[SwitchA-bgp-default] quit
# Configure Switch D to set the preferred value to 100 for routes received from Switch B.
[SwitchD-bgp-default-ipv6] peer 3002::1 preferred-value 100
[SwitchD-bgp-default-ipv6] quit
[SwitchD-bgp-default] quit
5. Configure BGP FRR:
# On Switch A, create routing policy frr to set a backup next hop 2001::2 (Switch C) for the route
destined for 4::/64.
<SwitchA> system-view
[SwitchA] ipv6 prefix-list abc index 10 permit 4:: 64
[SwitchA] route-policy frr permit node 10
[SwitchA-route-policy] if-match ipv6 address prefix-list abc
[SwitchA-route-policy] apply ipv6 fast-reroute backup-nexthop 2001::2
[SwitchA-route-policy] quit
# Apply the routing policy to BGP FRR for BGP IPv6 unicast address family.
[SwitchA] bgp 100
[SwitchA-bgp-default] address
-family ipv6 unicast
[SwitchA-bgp-default-ipv6] fast-reroute route-policy frr
[SwitchA-bgp-default-ipv6] quit
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