diff --git a/libraries/utils.robot b/libraries/utils.robot
index 908bfbc..59a6e55 100644
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -256,6 +256,28 @@
     ${logical_id}=    Get Logical Device ID From SN    ${olt_serial_number}
     Set Suite Variable    ${logical_id}
 
+Validate ONUs After OLT Disable
+    [Documentation]    Validates the ONUs state in Voltha, ONUs port state in ONOS
+    ...    and that pings do not succeed After corresponding OLT is Disabled
+    FOR    ${I}    IN RANGE    0    ${num_onus}
+        ${src}=    Set Variable    ${hosts.src[${I}]}
+        ${dst}=    Set Variable    ${hosts.dst[${I}]}
+        ${onu_device_id}=    Get Device ID From SN    ${src['onu']}
+        ${onu_port}=    Wait Until Keyword Succeeds    ${timeout}    2s    Get ONU Port in ONOS    ${src['onu']}
+        ...    ${of_id}
+        Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s
+        ...    Validate Device    ENABLED    DISCOVERED
+        ...    UNREACHABLE    ${src['onu']}    onu=True    onu_reason=stopping-openomci
+        Run Keyword And Continue On Failure    Wait Until Keyword Succeeds   ${timeout}    2s
+        ...    Verify ONU Port Is Disabled   ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${onu_port}
+        Run Keyword If    ${has_dataplane}    Run Keyword And Continue On Failure
+        ...    Wait Until Keyword Succeeds    60s    2s
+        ...    Check Ping    False    ${dst['dp_iface_ip_qinq']}    ${src['dp_iface_name']}
+        ...    ${src['ip']}    ${src['user']}    ${src['pass']}    ${src['container_type']}    ${src['container_name']}
+        Run Keyword and Ignore Error    Get Device Output from Voltha    ${onu_device_id}
+        Run Keyword and Ignore Error    Collect Logs
+    END
+
 Delete All Devices and Verify
     [Documentation]    Remove any devices from VOLTHA and ONOS
     # Clear devices from VOLTHA