diff --git a/tests/functional/Voltha_ONOSHATests.robot b/tests/functional/Voltha_ONOSHATests.robot
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+# Copyright 2020 - 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.
+# FIXME Can we use the same test against BBSim and Hardware?
+
+*** Settings ***
+Documentation     ONOS high avaliablity tests
+Suite Setup       Setup Suite
+Test Setup        Setup
+Test Teardown     Teardown
+Suite Teardown    Teardown Suite
+Library           Collections
+Library           String
+Library           OperatingSystem
+Library           XML
+Library           RequestsLibrary
+Library           ../../libraries/DependencyLibrary.py
+Resource          ../../libraries/onos.robot
+Resource          ../../libraries/voltctl.robot
+Resource          ../../libraries/voltha.robot
+Resource          ../../libraries/utils.robot
+Resource          ../../libraries/k8s.robot
+Resource          ../../variables/variables.robot
+Resource          ../../libraries/power_switch.robot
+
+*** Variables ***
+${POD_NAME}       flex-ocp-cord
+${KUBERNETES_CONF}    ${KUBERNETES_CONFIGS_DIR}/${POD_NAME}.conf
+${KUBERNETES_CONFIGS_DIR}    ~/pod-configs/kubernetes-configs
+${KUBERNETES_YAML}    ${KUBERNETES_CONFIGS_DIR}/${POD_NAME}.yml
+${HELM_CHARTS_DIR}    ~/helm-charts
+${VOLTHA_POD_NUM}    8
+${NAMESPACE}      default
+# For below variable value, using deployment name as using grep for
+# parsing radius pod name, we can also use full radius pod name
+${RESTART_POD_NAME}    radius
+${timeout}        60s
+${of_id}          0
+${logical_id}     0
+${has_dataplane}    True
+${teardown_device}    True
+${scripts}        ../../scripts
+${workflow}    ATT
+
+# Per-test logging on failure is turned off by default; set this variable to enable
+${container_log_dir}    ${None}
+
+*** Test Cases ***
+Verify restart ONOS instace master of device after subscriber is provisioned
+    [Documentation]    Restat ONOS instance master of a given device and check that during restart and after the
+    ...    subscriuber still has dataplane traffic.
+    ...    Prerequisite : ONUs are authenticated and pingable, thus setup and sanity is performed.
+    [Tags]    onosHa   VOL-3436   onosMasterRestart
+    [Setup]    Run Keywords    Start Logging    onosMasterRestart
+    ...        AND             Setup
+    [Teardown]    Run Keywords    Collect Logs
+    ...           AND             Stop Logging    onosMasterRestart
+    Run Keyword If    ${has_dataplane}    Clean Up Linux
+    Run Keyword If   '${workflow}' == 'ATT'    Wait Until Keyword Succeeds    ${timeout}    2s    Perform Sanity Test
+    Run Keyword If   '${workflow}' == 'DT'    Wait Until Keyword Succeeds    ${timeout}    2s    Perform Sanity Test DT
+    ${of_id}=    Wait Until Keyword Succeeds    ${timeout}    15s    Validate OLT Device in ONOS    ${olt_serial_number}
+    ${node_id}=    Wait Until Keyword Succeeds    20s    5s    Get Master Instace in ONOS    ${of_id}
+    ${podName}    Set Variable     ${node_id}
+    Wait Until Keyword Succeeds    ${timeout}    15s    Delete K8s Pods By Name    ${NAMESPACE}    ${podName}
+    Sleep    60s
+    Wait Until Keyword Succeeds    ${timeout}    2s    Validate Pods Status By Name    ${NAMESPACE}
+    ...    ${podName}    Running
+    # Performing Sanity Test to make sure subscribers are all AUTH+DHCP and pingable
+    Run Keyword If    ${has_dataplane}    Clean Up Linux
+    Run Keyword If   '${workflow}' == 'ATT'    Wait Until Keyword Succeeds    ${timeout}    2s    Perform Sanity Test
+    Run Keyword If   '${workflow}' == 'DT'    Wait Until Keyword Succeeds    ${timeout}    2s    Perform Sanity Test DT
+    Log to console    Pod ${podName} deleted and sanity checks passed successfully
+
+*** Keywords ***
+Setup Suite
+    [Documentation]    Set up the test suite
+    Common Test Suite Setup
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