diff --git a/devstack/README-NFP-Advanced-Mode b/devstack/README-NFP-Advanced-Mode
index 4b55ee6f5..08d3f2e05 100644
--- a/devstack/README-NFP-Advanced-Mode
+++ b/devstack/README-NFP-Advanced-Mode
@@ -12,25 +12,38 @@ Fresh Installation Steps:
 
 (3) Configure local.conf
     # Modify NFP_DEVSTACK_MODE to 'advanced'
-    # Configure following external network details,
+    # Configure the following external network details.
+    # If configured, install step creates resources required for external access.
+    # If not configured, user needs to create these resources as described in step 5 below.
       EXT_NET_GATEWAY=
       EXT_NET_ALLOCATION_POOL_START=
       EXT_NET_ALLOCATION_POOL_END=
       EXT_NET_CIDR=
-    # Configure the Configurator VM image path(optional),
+
+    # Configure the Configurator (NFP Controller) VM image path(optional),
     # If configured, install step uploads the specified image
     # If not configured, install step will build a new one and upload it
       ConfiguratorQcow2Image=
-    # Configure the Service VM image paths(optional),
+
+    # Configure Service VM image paths(optional),
     # If configured, install step uploads the specified images
     # If not configured, install step ignores uploading these service images
       VyosQcow2Image=
       HaproxyQcow2Image=
+
     # Configure PUBLIC_INTERFACE with the public interface name
 
 (4) Install devstack.
     # ./stack.sh
 
+(5) Create required basic GBP resources
+    # In step 3 above, if you have chosen not to create resources for external access, you may need
+    # to create them explicitly as described below.
+    # Note: This step is not required to excercise east west traffic
+    # Create external-network, external-subnet, external-segment, nat-pool, network-service-policy
+    # Configure "default_external_segment_name" option from "group_policy_implicit_policy" group
+    # with external-segment name created above  from neutron.conf
+    # Restart neutron-server service
 
 Re-installation Steps:
 ======================
diff --git a/devstack/lib/nfp b/devstack/lib/nfp
index 3cfb2bd3d..ecbeec562 100644
--- a/devstack/lib/nfp
+++ b/devstack/lib/nfp
@@ -125,7 +125,7 @@ function create_ep_and_nsp {
  default
 
     gbp nsp-create\
- --network-service-params type=ip_pool,name=vip_ip,value=nat_pool\
+ --network-service-params type=ip_pool,name=fip,value=nat_pool\
  svc_mgmt_fip_policy
 }
 
@@ -191,9 +191,10 @@ function create_nfp_gbp_resources {
  --service-flavor service_vendor=vyos,device_type=nova\
  --vendor NFP\
  vpn_profile
-
-        create_ext_net
-        create_ep_and_nsp
+        if [[ $EXT_NET_GATEWAY && $EXT_NET_ALLOCATION_POOL_START && $EXT_NET_ALLOCATION_POOL_END && $EXT_NET_CIDR ]]; then
+            create_ext_net
+            create_ep_and_nsp
+        fi
 
     fi
 
diff --git a/devstack/local.conf.nfp b/devstack/local.conf.nfp
index 40d3a2099..588792459 100644
--- a/devstack/local.conf.nfp
+++ b/devstack/local.conf.nfp
@@ -24,6 +24,8 @@ if [[ $ENABLE_NFP = True ]]; then
 
     if [[ $NFP_DEVSTACK_MODE = advanced ]]; then
         # External Network
+        # If configured, install step creates external network, external policy and network service policy
+        # If not configured, user has to create external network, external policy and network service policy
         EXT_NET_GATEWAY=
         EXT_NET_ALLOCATION_POOL_START=
         EXT_NET_ALLOCATION_POOL_END=
diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index 5786b8e32..3db5496e9 100755
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -35,7 +35,9 @@ function nfp_configure_neutron {
     iniset $NEUTRON_CONF admin_owned_resources_apic_tscp plumbing_resource_owner_user "neutron"
     iniset $NEUTRON_CONF admin_owned_resources_apic_tscp plumbing_resource_owner_password $ADMIN_PASSWORD
     iniset $NEUTRON_CONF admin_owned_resources_apic_tscp plumbing_resource_owner_tenant_name "service"
-    iniset $NEUTRON_CONF group_policy_implicit_policy default_external_segment_name "default"
+    if [[ $EXT_NET_GATEWAY && $EXT_NET_ALLOCATION_POOL_START && $EXT_NET_ALLOCATION_POOL_END && $EXT_NET_CIDR ]]; then
+        iniset $NEUTRON_CONF group_policy_implicit_policy default_external_segment_name "default"
+    fi
     iniset $NEUTRON_CONF nfp_node_driver is_service_admin_owned "True"
     iniset $NEUTRON_CONF nfp_node_driver svc_management_ptg_name "svc_management_ptg"
 }