[vagrant-up] vagrant up --parallel with virtualBox does not work.

[AM-PM]

I attached my sample vagrantfile, i am not able to configure my vagrantfile 
to use parallel feature.
I am usng "Vagrant 1.4.3" and virtualbox "VirtuaBox 4.3.6" for CentOS VMs

Documentation is not very 
helpful https://docs.vagrantup.com/v2/plugins/providers.html

has anyone achieved this with vagrant and virtualbox combination.?

Any help is much appreciated.


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# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure("2") do |config|

    config.vm.synced_folder "data", "/vagrant_data"
    config.vm.box = "centos64"

    config.vm.provision :puppet do |puppet|
        puppet.manifests_path = "puppet/manifests"
        puppet.manifest_file = "site.pp"
        puppet.module_path  = "puppet/modules"
        puppet.options = "--verbose --logdest syslog"
    end

    #-----------------------------------------------
    # Fuse boxes
    #-----------------------------------------------
    config.vm.define :besb do |besb|
        besb.vm.provider :virtualbox do |vb|
            vb.parallel = true
                        vb.gui = true
            vb.name = "EP_1"
        end
        besb.vm.network :private_network, ip: "192.168.33.11"
        besb.vm.hostname = "IND04-ep01-sb-01"
    end

    config.vm.define :iesb do |iesb|
        iesb.vm.provider :virtualbox do |vb|
                        vb.parallel = true
            vb.gui = true
            vb.name = "EP_2"
        end
        iesb.vm.network :private_network, ip: "192.168.33.12"
        iesb.vm.hostname = "IND04-ep01-sb-02"
    end

end