diff --git a/core/api/src/main/java/org/onosproject/net/config/Config.java b/core/api/src/main/java/org/onosproject/net/config/Config.java
index 0a3d87f..aac1320 100644
--- a/core/api/src/main/java/org/onosproject/net/config/Config.java
+++ b/core/api/src/main/java/org/onosproject/net/config/Config.java
@@ -95,15 +95,15 @@
      * <p>
      * Default implementation returns true.
      * Subclasses are expected to override this with their own validation.
-     * </p>
+     * Implementations are free to throw a RuntimeException if data is invalid.
+     * * </p>
      *
      * @return true if the data is valid; false otherwise
+     * @throws RuntimeException if configuration is invalid or completely foobar
      */
     public boolean isValid() {
-        // TODO: figure out what assertions could be made in the base class
-        // NOTE: The thought is to have none, but instead to provide a set
-        // of predicates to allow configs to test validity of present fields,
-        // e.g.:
+        // Derivatives should use the provided set of predicates to test
+        // validity of their fields, e.g.:
         //      isString(path)
         //      isBoolean(path)
         //      isNumber(path, [min, max])
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/AllowedEntityConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/AllowedEntityConfig.java
index 6e6663c..ee4042c 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/AllowedEntityConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/AllowedEntityConfig.java
@@ -23,7 +23,7 @@
  */
 public abstract class AllowedEntityConfig<S> extends Config<S> {
 
-    private static final String ALLOWED = "allowed";
+    protected static final String ALLOWED = "allowed";
 
     /**
      * Indicates whether the element is allowed for admission into the control
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/BasicDeviceConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/BasicDeviceConfig.java
index afde9a9..add8cf3 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/BasicDeviceConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/BasicDeviceConfig.java
@@ -21,11 +21,17 @@
 /**
  * Basic configuration for network infrastructure devices.
  */
-public class BasicDeviceConfig extends BasicElementConfig<DeviceId> {
+public final class BasicDeviceConfig extends BasicElementConfig<DeviceId> {
 
-    public static final String TYPE = "type";
-    public static final String DRIVER = "driver";
-    public static final String MANAGEMENT_ADDRESS = "managementAddress";
+    private static final String TYPE = "type";
+    private static final String DRIVER = "driver";
+    private static final String MANAGEMENT_ADDRESS = "managementAddress";
+
+    @Override
+    public boolean isValid() {
+        return hasOnlyFields(ALLOWED, NAME, LATITUDE, LONGITUDE, RACK_ADDRESS, OWNER,
+                             TYPE, DRIVER, MANAGEMENT_ADDRESS);
+    }
 
     /**
      * Returns the device type.
@@ -85,6 +91,6 @@
     }
 
     // TODO: device port meta-data to be configured via BasicPortsConfig
-    // TODO: device credentials/keys
+    // TODO: device credentials/keys; in a separate config
 
 }
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/BasicElementConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/BasicElementConfig.java
index 7b3248c..10d753b 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/BasicElementConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/BasicElementConfig.java
@@ -22,13 +22,13 @@
  */
 public abstract class BasicElementConfig<S> extends AllowedEntityConfig<S> {
 
-    public static final String NAME = "name";
+    protected static final String NAME = "name";
 
-    public static final String LATITUDE = "latitude";
-    public static final String LONGITUDE = "longitude";
+    protected static final String LATITUDE = "latitude";
+    protected static final String LONGITUDE = "longitude";
 
-    public static final String RACK_ADDRESS = "rackAddress";
-    public static final String OWNER = "owner";
+    protected static final String RACK_ADDRESS = "rackAddress";
+    protected static final String OWNER = "owner";
 
     protected static final double DEFAULT_COORD = -1.0;
 
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/BasicHostConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/BasicHostConfig.java
index 9294631..8429630 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/BasicHostConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/BasicHostConfig.java
@@ -19,68 +19,62 @@
 import org.onlab.packet.IpAddress;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.HostId;
+
 import java.util.HashSet;
 import java.util.Set;
 
+import static org.onosproject.net.config.basics.AllowedEntityConfig.ALLOWED;
+
 /**
  * Basic configuration for network end-station hosts.
  */
-public class BasicHostConfig extends BasicElementConfig<HostId> {
+public final class BasicHostConfig extends BasicElementConfig<HostId> {
+
     private static final String IPS = "ips";
     private static final String LOCATION = "location";
 
     @Override
     public boolean isValid() {
-        return hasOnlyFields(IPS, LOCATION) &&
-                this.location() != null &&
-                this.ipAddresses() != null;
+        // Location and IP addresses can be absent, but if present must be valid.
+        this.location();
+        this.ipAddresses();
+        return hasOnlyFields(ALLOWED, NAME, LATITUDE, LONGITUDE, RACK_ADDRESS, OWNER,
+                             IPS, LOCATION);
     }
 
     /**
-     * Gets location of the host.
+     * Returns location of the host.
      *
-     * @return location of the host. Or null if not specified with correct format.
+     * @return location of the host or null if not set
+     * @throws IllegalArgumentException if not specified with correct format
      */
     public ConnectPoint location() {
         String location = get(LOCATION, null);
-
-        if (location != null) {
-            try {
-                return ConnectPoint.deviceConnectPoint(location);
-            } catch (Exception e) {
-                return null;
-            }
-        }
-        return null;
+        return location != null ? ConnectPoint.deviceConnectPoint(location) : null;
     }
 
     /**
      * Sets the location of the host.
      *
-     * @param location location of the host.
-     * @return the config of the host.
+     * @param location location of the host or null to unset
+     * @return the config of the host
      */
     public BasicHostConfig setLocation(String location) {
         return (BasicHostConfig) setOrClear(LOCATION, location);
     }
 
     /**
-     * Gets IP addresses of the host.
+     * Returns IP addresses of the host.
      *
-     * @return IP addresses of the host. Or null if not specified with correct format.
+     * @return IP addresses of the host or null if not set
+     * @throws IllegalArgumentException if not specified with correct format
      */
     public Set<IpAddress> ipAddresses() {
         HashSet<IpAddress> ipAddresses = new HashSet<>();
         if (object.has(IPS)) {
             ArrayNode ipNodes = (ArrayNode) object.path(IPS);
-            try {
-                ipNodes.forEach(ipNode -> {
-                    ipAddresses.add(IpAddress.valueOf(ipNode.asText()));
-                });
-                return ipAddresses;
-            } catch (Exception e) {
-                return null;
-            }
+            ipNodes.forEach(n -> ipAddresses.add(IpAddress.valueOf(n.asText())));
+            return ipAddresses;
         }
         return null;
     }
@@ -88,8 +82,8 @@
     /**
      * Sets the IP addresses of the host.
      *
-     * @param ipAddresses IP addresses of the host.
-     * @return the config of the host.
+     * @param ipAddresses IP addresses of the host or null to unset
+     * @return the config of the host
      */
     public BasicHostConfig setIps(Set<IpAddress> ipAddresses) {
         return (BasicHostConfig) setOrClear(IPS, ipAddresses);
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/BasicLinkConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/BasicLinkConfig.java
index ed807b8..0ad851a 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/BasicLinkConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/BasicLinkConfig.java
@@ -26,19 +26,19 @@
 /**
  * Basic configuration for network infrastructure link.
  */
-public class BasicLinkConfig extends AllowedEntityConfig<LinkKey> {
+public final class BasicLinkConfig extends AllowedEntityConfig<LinkKey> {
 
-    public static final String TYPE = "type";
-    public static final String METRIC = "metric";
-    public static final String LATENCY = "latency";
-    public static final String BANDWIDTH = "bandwidth";
-    public static final String IS_DURABLE = "durable";
+    private static final String TYPE = "type";
+    private static final String METRIC = "metric";
+    private static final String LATENCY = "latency";
+    private static final String BANDWIDTH = "bandwidth";
+    private static final String IS_DURABLE = "durable";
 
     @Override
     public boolean isValid() {
-        return hasOnlyFields(TYPE, METRIC, LATENCY, BANDWIDTH, IS_DURABLE) &&
-                isNumber(METRIC, OPTIONAL) && isNumber(LATENCY, OPTIONAL) &&
-                isNumber(BANDWIDTH, OPTIONAL);
+        return hasOnlyFields(ALLOWED, TYPE, METRIC, LATENCY, BANDWIDTH, IS_DURABLE) &&
+                isBoolean(ALLOWED, OPTIONAL) && isNumber(METRIC, OPTIONAL) &&
+                isNumber(LATENCY, OPTIONAL) && isNumber(BANDWIDTH, OPTIONAL);
     }
 
     /**
diff --git a/core/api/src/main/java/org/onosproject/net/config/basics/OpticalPortConfig.java b/core/api/src/main/java/org/onosproject/net/config/basics/OpticalPortConfig.java
index dfb494d..7a1b801 100644
--- a/core/api/src/main/java/org/onosproject/net/config/basics/OpticalPortConfig.java
+++ b/core/api/src/main/java/org/onosproject/net/config/basics/OpticalPortConfig.java
@@ -23,11 +23,13 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 
+import static org.onosproject.net.config.Config.FieldPresence.OPTIONAL;
+
 
 /**
  * Configurations for an optical port on a device.
  */
-public class OpticalPortConfig extends Config<ConnectPoint> {
+public final class OpticalPortConfig extends Config<ConnectPoint> {
     // optical type {OMS, OCH, ODUClt, fiber}
     public static final String TYPE = "type";
 
@@ -42,6 +44,12 @@
     // **Linc-OE : remove if it's not needed after all.**
     public static final String SPEED = "speed";
 
+    @Override
+    public boolean isValid() {
+        return hasOnlyFields(TYPE, NAME, PORT, STATIC_PORT, STATIC_LAMBDA, SPEED) &&
+                isNumber(STATIC_LAMBDA, OPTIONAL) && isNumber(SPEED, OPTIONAL);
+    }
+
     /**
      * Returns the Enum value representing the type of port.
      *
diff --git a/core/net/src/main/java/org/onosproject/net/device/impl/BasicDeviceOperator.java b/core/net/src/main/java/org/onosproject/net/device/impl/BasicDeviceOperator.java
index a498b3f..108d68d 100644
--- a/core/net/src/main/java/org/onosproject/net/device/impl/BasicDeviceOperator.java
+++ b/core/net/src/main/java/org/onosproject/net/device/impl/BasicDeviceOperator.java
@@ -32,7 +32,7 @@
 
 /**
  * Implementations of merge policies for various sources of device configuration
- * information. This includes applications, provides, and network configurations.
+ * information. This includes applications, providers, and network configurations.
  */
 public final class BasicDeviceOperator implements ConfigOperator {
 
diff --git a/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java b/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java
index 68aa27f..14b86d2 100644
--- a/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java
+++ b/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java
@@ -15,25 +15,26 @@
  */
 package org.onosproject.net.host.impl;
 
-import static org.slf4j.LoggerFactory.getLogger;
-
-import org.slf4j.Logger;
+import org.onlab.packet.IpAddress;
+import org.onosproject.net.AnnotationKeys;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.SparseAnnotations;
 import org.onosproject.net.config.ConfigOperator;
 import org.onosproject.net.config.basics.BasicHostConfig;
-import org.onosproject.net.AnnotationKeys;
-import org.onosproject.net.DefaultAnnotations;
-import org.onosproject.net.SparseAnnotations;
 import org.onosproject.net.host.DefaultHostDescription;
 import org.onosproject.net.host.HostDescription;
 
+import java.util.Set;
+
 /**
  * Implementations of merge policies for various sources of host configuration
- * information. This includes applications, provides, and network configurations.
+ * information. This includes applications, providers, and network configurations.
  */
 public final class BasicHostOperator implements ConfigOperator {
 
     protected static final double DEFAULT_COORD = -1.0;
-    private static final Logger log = getLogger(BasicHostOperator.class);
 
     private BasicHostOperator() {
     }
@@ -42,7 +43,7 @@
      * Generates a HostDescription containing fields from a HostDescription and
      * a HostConfig.
      *
-     * @param cfg the host config entity from network config
+     * @param cfg   the host config entity from network config
      * @param descr a HostDescription
      * @return HostDescription based on both sources
      */
@@ -50,16 +51,29 @@
         if (cfg == null) {
             return descr;
         }
+
+        HostLocation location = descr.location();
+        ConnectPoint cfgLocation = cfg.location();
+        if (cfgLocation != null) {
+            location = new HostLocation(cfgLocation, System.currentTimeMillis());
+        }
+
+        Set<IpAddress> ipAddresses = descr.ipAddress();
+        Set<IpAddress> cfgIpAddresses = cfg.ipAddresses();
+        if (cfgIpAddresses != null) {
+            ipAddresses = cfgIpAddresses;
+        }
+
         SparseAnnotations sa = combine(cfg, descr.annotations());
-        return new DefaultHostDescription(descr.hwAddress(), descr.vlan(), descr.location(),
-                descr.ipAddress(), sa);
+        return new DefaultHostDescription(descr.hwAddress(), descr.vlan(),
+                                          location, ipAddresses, sa);
     }
 
     /**
      * Generates an annotation from an existing annotation and HostConfig.
      *
      * @param cfg the device config entity from network config
-     * @param an the annotation
+     * @param an  the annotation
      * @return annotation combining both sources
      */
     public static SparseAnnotations combine(BasicHostConfig cfg, SparseAnnotations an) {
diff --git a/tools/dev/bash_profile b/tools/dev/bash_profile
index c9bca80..69f8c43 100644
--- a/tools/dev/bash_profile
+++ b/tools/dev/bash_profile
@@ -192,4 +192,4 @@
 
 
 # Load AT&T MPLS topo GEO data
-alias atttopo='onos-topo-cfg $OCI $ONOS_ROOT/tools/test/topos/attmpls.json'
\ No newline at end of file
+alias atttopo='onos-netcfg $OCI $ONOS_ROOT/tools/test/topos/attmpls-cfg.json'
\ No newline at end of file
diff --git a/tools/test/bin/onos-netcfg b/tools/test/bin/onos-netcfg
index 23900ec..3942428 100755
--- a/tools/test/bin/onos-netcfg
+++ b/tools/test/bin/onos-netcfg
@@ -10,6 +10,6 @@
 file="${2:-$ONOS_ROOT/tools/test/topos/oe-linear-3.json}"
 url="${3}"
 
-curl -sS --fail -L --user $ONOS_WEB_USER:$ONOS_WEB_PASS \
+curl --fail -L --user $ONOS_WEB_USER:$ONOS_WEB_PASS \
     -X POST -H 'Content-Type:application/json' \
     http://$node:8181/onos/v1/network/configuration/${url} -d@$file
diff --git a/tools/test/scenarios/net-pingall.xml b/tools/test/scenarios/net-pingall.xml
index 100ceba..eb2ec7a 100644
--- a/tools/test/scenarios/net-pingall.xml
+++ b/tools/test/scenarios/net-pingall.xml
@@ -30,8 +30,5 @@
 
         <step name="Check-Summary-For-Hosts" requires="~Ping-All-And-Verify"
               exec="onos-check-summary ${OC1} [0-9]* 25 140 25"/>
-
-        <step name="Config-Topo" requires="~Check-Summary-For-Hosts"
-              exec="onos-topo-cfg ${OC1} ${ONOS_ROOT}/tools/test/topos/attmpls.json"/>
     </group>
 </scenario>
diff --git a/tools/test/scenarios/net-setup.xml b/tools/test/scenarios/net-setup.xml
index ce15bf8..4e5125a 100644
--- a/tools/test/scenarios/net-setup.xml
+++ b/tools/test/scenarios/net-setup.xml
@@ -24,8 +24,11 @@
         <step name="Initial-Summary-Check" requires="~Wipe-Out-Data-Before"
               exec="onos-check-summary ${OC1} [0-9]* 0 0 0"/>
 
+        <step name="Config-Topo" requires="~Initial-Summary-Check"
+              exec="onos-netcfg ${OC1} ${ONOS_ROOT}/tools/test/topos/attmpls-cfg.json"/>
+
         <step name="Start-Mininet"
-              requires="Install-Apps,Initial-Summary-Check,Push-Topos,Stop-Mininet-If-Needed"
+              requires="Install-Apps,Config-Topo,Push-Topos,Stop-Mininet-If-Needed"
               exec="onos-mininet start topos/topo att-onos.py ${ONOS_INSTANCES}"/>
 
         <step name="Wait-For-Mininet" requires="Start-Mininet"
diff --git a/tools/test/topos/attmpls-cfg.json b/tools/test/topos/attmpls-cfg.json
new file mode 100644
index 0000000..c144606
--- /dev/null
+++ b/tools/test/topos/attmpls-cfg.json
@@ -0,0 +1,57 @@
+{
+  "devices": {
+    "of:0000000000000001": { "basic": { "name": "CMBR", "latitude": 42.373730, "longitude": -71.109734  }},
+    "of:0000000000000002": { "basic": { "name": "CHCG", "latitude": 41.877461, "longitude": -87.642892  }},
+    "of:0000000000000003": { "basic": { "name": "CLEV", "latitude": 41.498928, "longitude": -81.695217  }},
+    "of:0000000000000004": { "basic": { "name": "RLGH", "latitude": 35.780150, "longitude": -78.644026  }},
+    "of:0000000000000005": { "basic": { "name": "ATLN", "latitude": 33.749017, "longitude": -84.394168  }},
+    "of:0000000000000006": { "basic": { "name": "PHLA", "latitude": 39.952906, "longitude": -75.172278  }},
+    "of:0000000000000007": { "basic": { "name": "WASH", "latitude": 38.906696, "longitude": -77.035509  }},
+    "of:0000000000000008": { "basic": { "name": "NSVL", "latitude": 36.166410, "longitude": -86.787305  }},
+    "of:0000000000000009": { "basic": { "name": "STLS", "latitude": 38.626418, "longitude": -90.198143  }},
+    "of:000000000000000a": { "basic": { "name": "NWOR", "latitude": 29.951475, "longitude": -90.078434  }},
+    "of:000000000000000b": { "basic": { "name": "HSTN", "latitude": 29.763249, "longitude": -95.368332  }},
+    "of:000000000000000c": { "basic": { "name": "SNAN", "latitude": 29.424331, "longitude": -98.491745  }},
+    "of:000000000000000d": { "basic": { "name": "DLLS", "latitude": 32.777665, "longitude": -96.802064  }},
+    "of:000000000000000e": { "basic": { "name": "ORLD", "latitude": 28.538641, "longitude": -81.381110  }},
+    "of:000000000000000f": { "basic": { "name": "DNVR", "latitude": 39.736623, "longitude": -104.984887 }},
+    "of:0000000000000010": { "basic": { "name": "KSCY", "latitude": 39.100725, "longitude": -94.581228  }},
+    "of:0000000000000011": { "basic": { "name": "SNFN", "latitude": 37.779751, "longitude": -122.409791 }},
+    "of:0000000000000012": { "basic": { "name": "SCRM", "latitude": 38.581001, "longitude": -121.497844 }},
+    "of:0000000000000013": { "basic": { "name": "PTLD", "latitude": 45.523317, "longitude": -122.677768 }},
+    "of:0000000000000014": { "basic": { "name": "STTL", "latitude": 47.607326, "longitude": -122.331786 }},
+    "of:0000000000000015": { "basic": { "name": "SLKC", "latitude": 40.759577, "longitude": -111.895079 }},
+    "of:0000000000000016": { "basic": { "name": "LA03", "latitude": 34.056346, "longitude": -118.235951 }},
+    "of:0000000000000017": { "basic": { "name": "SNDG", "latitude": 32.714564, "longitude": -117.153528 }},
+    "of:0000000000000018": { "basic": { "name": "PHNX", "latitude": 33.448289, "longitude": -112.076299 }},
+    "of:0000000000000019": { "basic": { "name": "NY54", "latitude": 40.728270, "longitude": -73.994483  }}
+  },
+
+  "hosts": {
+    "00:00:00:00:00:01/-1": { "basic": { "location": "of:0000000000000001/1", "ips": [ "10.0.0.1" ],  "name": "CMBR", "latitude": 43.355715, "longitude":  -69.528243 }},
+    "00:00:00:00:00:02/-1": { "basic": { "location": "of:0000000000000002/1", "ips": [ "10.0.0.2" ],  "name": "CHCG", "latitude": 43.632679, "longitude":  -88.772526 }},
+    "00:00:00:00:00:03/-1": { "basic": { "location": "of:0000000000000003/1", "ips": [ "10.0.0.3" ],  "name": "CLEV", "latitude": 42.756945, "longitude":  -79.831317 }},
+    "00:00:00:00:00:04/-1": { "basic": { "location": "of:0000000000000004/1", "ips": [ "10.0.0.4" ],  "name": "RLGH", "latitude": 36.972249, "longitude":  -76.667163 }},
+    "00:00:00:00:00:05/-1": { "basic": { "location": "of:0000000000000005/1", "ips": [ "10.0.0.5" ],  "name": "ATLN", "latitude": 35.427493, "longitude":  -83.885831 }},
+    "00:00:00:00:00:06/-1": { "basic": { "location": "of:0000000000000006/1", "ips": [ "10.0.0.6" ],  "name": "PHLA", "latitude": 39.208113, "longitude":  -73.421341 }},
+    "00:00:00:00:00:07/-1": { "basic": { "location": "of:0000000000000007/1", "ips": [ "10.0.0.7" ],  "name": "WASH", "latitude": 40.133860, "longitude":  -79.238299 }},
+    "00:00:00:00:00:08/-1": { "basic": { "location": "of:0000000000000008/1", "ips": [ "10.0.0.8" ],  "name": "NSVL", "latitude": 37.407589, "longitude":  -84.415068 }},
+    "00:00:00:00:00:09/-1": { "basic": { "location": "of:0000000000000009/1", "ips": [ "10.0.0.9" ],  "name": "STLS", "latitude": 40.066810, "longitude":  -90.932405 }},
+    "00:00:00:00:00:0a/-1": { "basic": { "location": "of:000000000000000a/1", "ips": [ "10.0.0.10" ], "name": "NWOR", "latitude": 31.470982, "longitude":  -88.779353 }},
+    "00:00:00:00:00:0b/-1": { "basic": { "location": "of:000000000000000b/1", "ips": [ "10.0.0.11" ], "name": "HSTN", "latitude": 31.136858, "longitude":  -94.351656 }},
+    "00:00:00:00:00:0c/-1": { "basic": { "location": "of:000000000000000c/1", "ips": [ "10.0.0.12" ], "name": "SNAN", "latitude": 28.040975, "longitude":  -99.169527 }},
+    "00:00:00:00:00:0d/-1": { "basic": { "location": "of:000000000000000d/1", "ips": [ "10.0.0.13" ], "name": "DLLS", "latitude": 31.899825, "longitude":  -99.287263 }},
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