Before configuring DHCPv6 snooping, run the dhcpv6 snooping enable command to enable DHCPv6 snooping. Enable DHCPv6 snooping globally and then on interfaces. Other DHCPv6 snooping functions can be configured only after DHCPv6 snooping is enabled globally.
Example
# Enable automatic backup of DHCPv6 snooping binding entries.