def ipv6_interval=(arr)
      interval, min_rx, multiplier = arr
      set_args_keys(interval: interval, min_rx: min_rx, multiplier: multiplier,
                    state: arr == default_ipv6_interval ? 'no' : '')
      config_set('bfd_global', 'ipv6_interval', @set_args)
    end
def ipv6_interval=(arr)
      interval, min_rx, multiplier = arr
      set_args_keys(interval: interval, min_rx: min_rx, multiplier: multiplier,
                    state: arr == default_ipv6_interval ? 'no' : '')
      config_set('bfd_global', 'ipv6_interval', @set_args)
    end
ipv6_interval is an array of ipv6_interval, ipv6_min_rx and
 ipv6_multiplier
 ex: ['100', '100', '25']
 CLI: bfd ipv6 interval 100 min_rx 100 multiplier 25