+OPNFV_ARTIFACTS = 'http://storage.googleapis.com/artifacts.opnfv.org'
+CUSTOM_OVS = '{}/apex/random/openvswitch-2.9.0-9.el7fdn.x86_64.' \
+ 'rpm'.format(OPNFV_ARTIFACTS)
+
+OVS_URL = "http://openvswitch.org/releases/openvswitch-2.9.2.tar.gz"
+QUAGGA_URL = "{}/sdnvpn/quagga/quagga-4.tar.gz".format(OPNFV_ARTIFACTS)
+CALIPSO_INSTALLER_URL = "https://raw.githubusercontent.com/opnfv/calipso" \
+ "/master/app/install/calipso-installer.py"