# File lib/fog/network/openstack/requests/update_ipsec_policy.rb, line 5
        def update_ipsec_policy(ipsec_policy_id, options = {})
          data = {'ipsecpolicy' => {}}

          vanilla_options = [:name, :description, :tenant_id,
                             :auth_algorithm, :encryption_algorithm,
                             :pfs, :transform_protocol, :encapsulation_mode,
                             :lifetime, :ipsec_version]
          vanilla_options.select { |o| options.key?(o) }.each do |key|
            data['ipsecpolicy'][key] = options[key]
          end

          request(
            :body    => Fog::JSON.encode(data),
            :expects => 200,
            :method  => 'PUT',
            :path    => "vpn/ipsecpolicies/#{ipsec_policy_id}"
          )
        end