diff --git a/apps/pom.xml b/apps/pom.xml
index 8ed0f84..dafedbc 100644
--- a/apps/pom.xml
+++ b/apps/pom.xml
@@ -99,6 +99,7 @@
         <module>openstacknetworkingui</module>
         <module>cfm</module>
         <module>routeradvertisement</module>
+        <module>t3</module>
     </modules>
 
     <properties>
diff --git a/apps/t3/BUCK b/apps/t3/BUCK
new file mode 100644
index 0000000..cc05798
--- /dev/null
+++ b/apps/t3/BUCK
@@ -0,0 +1,21 @@
+COMPILE_DEPS = [
+    '//lib:CORE_DEPS',
+    '//lib:KRYO',
+    '//core/store/serializers:onos-core-serializers',
+    '//core/store/primitives:onos-core-primitives',
+    '//core/api:onos-api',
+    '//lib:org.apache.karaf.shell.console',
+    '//cli:onos-cli',
+]
+
+osgi_jar_with_tests (
+    deps = COMPILE_DEPS,
+)
+
+onos_app (
+    title = 'Trellis Troubleshooting Toolkit',
+    category = 'Utilities',
+    url = 'http://onosproject.org',
+    description = 'Provides static analysis of flows and groups ' +
+    'to determine the possible paths a packet may take.',
+)
diff --git a/apps/t3/pom.xml b/apps/t3/pom.xml
new file mode 100644
index 0000000..b02fe28
--- /dev/null
+++ b/apps/t3/pom.xml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2017-present Open Networking Foundation
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-apps</artifactId>
+        <version>1.12.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>onos-app-t3</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>Trellis Troubleshooting Toolkit</description>
+
+    <properties>
+        <onos.app.name>org.onosproject.t3</onos.app.name>
+        <onos.app.title>Trellis Troubleshooting Toolkit</onos.app.title>
+        <onos.app.category>Utilities</onos.app.category>
+        <onos.app.url>http://onosproject.org</onos.app.url>
+        <onos.app.readme>Static analysis of flows and groups to determine paths of packets.</onos.app.readme>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.compendium</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-core-serializers</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-core-primitives</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-cli</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.karaf.shell</groupId>
+            <artifactId>org.apache.karaf.shell.console</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>org.apache.felix.scr.annotations</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>
diff --git a/apps/t3/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java b/apps/t3/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java
new file mode 100644
index 0000000..e6ee8e8
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.t3.api;
+
+/**
+ * Encapsulates the result of tracing a packet (traffic selector) through
+ * the current topology.
+ */
+public class StaticPacketTrace {
+
+}
diff --git a/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java b/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java
new file mode 100644
index 0000000..9b17382
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/api/TroubleshootService.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.t3.api;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.TrafficSelector;
+
+/**
+ * API for troubleshooting services, providing static analysis of installed
+ * flows and groups.
+ */
+public interface TroubleshootService {
+
+
+    /**
+     * Requests a static trace be performed for the given traffic selector
+     * starting at the given connect point.
+     *
+     * @param packet description of packet
+     * @param in point at which packet starts
+     * @return a trace result
+     */
+    StaticPacketTrace trace(TrafficSelector packet, ConnectPoint in);
+}
diff --git a/apps/t3/src/main/java/org/onosproject/t3/api/package-info.java b/apps/t3/src/main/java/org/onosproject/t3/api/package-info.java
new file mode 100644
index 0000000..152d568
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/api/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Troubleshooting toolkit for trellis fabrics API.
+ */
+package org.onosproject.t3.api;
diff --git a/apps/t3/src/main/java/org/onosproject/t3/cli/package-info.java b/apps/t3/src/main/java/org/onosproject/t3/cli/package-info.java
new file mode 100644
index 0000000..b956df2
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/cli/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Troubleshooting toolkit for trellis fabrics CLI.
+ */
+package org.onosproject.t3.cli;
diff --git a/apps/t3/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java b/apps/t3/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java
new file mode 100644
index 0000000..03f1e75
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.t3.impl;
+
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.group.GroupService;
+import org.onosproject.t3.api.StaticPacketTrace;
+import org.onosproject.t3.api.TroubleshootService;
+import org.slf4j.Logger;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Designates ...
+ */
+@Service
+@Component(immediate = true)
+public class TroubleshootManager implements TroubleshootService {
+
+    private static final Logger log = getLogger(TroubleshootManager.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowRuleService flowRuleService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected GroupService groupService;
+
+
+
+    @Override
+    public StaticPacketTrace trace(TrafficSelector packet, ConnectPoint in) {
+        return null;
+    }
+}
diff --git a/apps/t3/src/main/java/org/onosproject/t3/impl/package-info.java b/apps/t3/src/main/java/org/onosproject/t3/impl/package-info.java
new file mode 100644
index 0000000..dfcc294
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Troubleshooting toolkit for trellis fabrics implementation.
+ */
+package org.onosproject.t3.impl;
diff --git a/apps/t3/src/main/java/org/onosproject/t3/package-info.java b/apps/t3/src/main/java/org/onosproject/t3/package-info.java
new file mode 100644
index 0000000..2dae6e2
--- /dev/null
+++ b/apps/t3/src/main/java/org/onosproject/t3/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Troubleshooting toolkit for trellis fabrics.
+ */
+package org.onosproject.t3;