Key points
-Define Northbound and Southbound traffic.
-Drop DHCP traffic from Southbound
enable configure terminal ipv6 access-list acl1 permit host FE80::A8BB:CCFF:FE01:F700 any ipv6 prefix-list abc permit 2001:0DB8::/64 le 128 ipv6 dhcp guard policy pol1 device-role server match server access-list acl1 match reply prefix-list abc preference min 0 preference max 255 trusted-port interface GigabitEthernet 0/2/0 switchport ipv6 dhcp guard attach-policy pol1 vlan add 1 vlan 1 ipv6 dhcp guard attach-policy pol1 show ipv6 dhcp guard policy pol1