diff --git a/src/test/cord-api/Tests/WorkflowValidations/ATT_Test001.robot b/src/test/cord-api/Tests/WorkflowValidations/ATT_Test001.robot
index 09ddef4..3f9ef31 100644
--- a/src/test/cord-api/Tests/WorkflowValidations/ATT_Test001.robot
+++ b/src/test/cord-api/Tests/WorkflowValidations/ATT_Test001.robot
@@ -283,6 +283,30 @@
     Wait Until Keyword Succeeds    60s    2s    Validate Subscriber Status    enabled    ${onu_device}
     Validate DHCP and Ping    True    True    ${src_iface}    ${s_tag}    ${c_tag}    ${dst_dp_ip}    ${src_ip}    ${src_user}    ${src_pass}    ${src_container_type}    ${src_container_name}    ${dst_dp_iface}    ${dst_ip}    ${dst_user}    ${dst_pass}    ${dst_container_type}    ${dst_container_name}
 
+ONU in whitelist -> Admin disable ONU
+    [Documentation]    Validates E2E Ping Connectivity and object states for the given scenario:
+    ...    Configure whitelist with correct ONU location
+    ...    Validate successful authentication/DHCP/E2E ping
+    ...    Perform admin disable on the ONU
+    ...    Verify that pings are not successful
+    ...    Perform admin enable on the ONU
+    ...    Validate authentication/DHCP/E2E ping 
+    [Tags]    test11
+    Wait Until Keyword Succeeds    300s    15s    Validate ONU States    ACTIVE    ENABLED    ${onu_device}
+    Wait Until Keyword Succeeds    60s    2s    Validate ATT Workflow Driver SI    ENABLED    AWAITING    ${onu_device}
+    Wait Until Keyword Succeeds    60s    2s    Validate Subscriber Status    awaiting-auth    ${onu_device}
+    Validate Authentication    True    ${src_iface}    wpa_supplicant.conf    ${src_ip}    ${src_user}    ${src_pass}    ${src_container_type}    ${src_conta    iner_name}
+    Wait Until Keyword Succeeds    60s    2s    Validate ATT Workflow Driver SI    ENABLED    APPROVED    ${onu_device}
+    Wait Until Keyword Succeeds    60s    2s    Validate Subscriber Status    enabled    ${onu_device}
+    Validate DHCP and Ping    True    True    ${src_iface}    ${s_tag}    ${c_tag}    ${dst_dp_ip}    ${src_ip}    ${src_user}    ${src_pass}    ${src_contai    ner_type}    ${src_container_name}    ${dst_dp_iface}    ${dst_ip}    ${dst_user}    ${dst_pass}    ${dst_container_type}    ${dst_container_name}a
+    Update ONU AdminState    DISABLED
+    Wait Until Keyword Succeeds    60s    2s    Check Ping    False    ${dst_dp_ip}    ${src_iface}    ${src_ip}    ${src_user}    ${src_p    ass}
+    Update ONU AdminState    ENABLED
+    Validate Authentication    True    ${src_iface}    wpa_supplicant.conf    ${src_ip}    ${src_user}    ${src_pass}    ${src_container_type}    ${src_conta    iner_name}
+    Wait Until Keyword Succeeds    60s    2s    Validate ATT Workflow Driver SI    ENABLED    APPROVED    ${onu_device}
+    Wait Until Keyword Succeeds    60s    2s    Validate Subscriber Status    enabled    ${onu_device}
+    Validate DHCP and Ping    True    True    ${src_iface}    ${s_tag}    ${c_tag}    ${dst_dp_ip}    ${src_ip}    ${src_user}    ${src_pass}    ${src_contai    ner_type}    ${src_container_name}    ${dst_dp_iface}    ${dst_ip}    ${dst_user}    ${dst_pass}    ${dst_container_type}    ${dst_container_name}a
+
 *** Keywords ***
 Setup Suite
     ${auth} =    Create List    ${XOS_USER}    ${XOS_PASSWD}
@@ -430,3 +454,8 @@
 
 Create VOLT
     CORD Post    ${VOLT_DEVICE}    ${VoltDeviceDict}
+
+Update ONU AdminState
+    [Arguments]    ${new_admin_state}
+    ${onudevice_id}=    Retrieve ONU Device    ${onu_device}
+    CORD Put    ${VOLT_DEVICE}    ${"admin_state": ${new_admin_state} }    ${onudevice_id}