diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties.py
index 7cf72fd0ab20..58fe5fd248d7 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties.py
@@ -67,15 +67,27 @@ class ApiManagementServiceBaseProperties(Model):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed
diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties_py3.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties_py3.py
index cadc56f88b6b..0a1ea1b847c8 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties_py3.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_base_properties_py3.py
@@ -67,15 +67,27 @@ class ApiManagementServiceBaseProperties(Model):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed
diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource.py
index 23867d44ffdf..666e19366232 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource.py
@@ -78,15 +78,27 @@ class ApiManagementServiceResource(ApimResource):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed
diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource_py3.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource_py3.py
index 8e2213108bd0..f3f19c242364 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource_py3.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_resource_py3.py
@@ -78,15 +78,27 @@ class ApiManagementServiceResource(ApimResource):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed
diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters.py
index aca59f821f77..6196eed4b5c8 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters.py
@@ -76,15 +76,27 @@ class ApiManagementServiceUpdateParameters(ApimResource):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed
diff --git a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters_py3.py b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters_py3.py
index 76a51b033344..47d242217e69 100644
--- a/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters_py3.py
+++ b/sdk/apimanagement/azure-mgmt-apimanagement/azure/mgmt/apimanagement/models/api_management_service_update_parameters_py3.py
@@ -76,15 +76,27 @@ class ApiManagementServiceUpdateParameters(ApimResource):
      Management service.
     :type additional_locations:
      list[~azure.mgmt.apimanagement.models.AdditionalLocation]
-    :param custom_properties: Custom properties of the API Management service.
-     Setting
+    :param custom_properties: Custom properties of the API Management
+     service.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Ciphers.TripleDes168`
      will disable the cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA for all TLS(1.0, 1.1
-     and 1.2). Setting
+     and 1.2).</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls11`
-     can be used to disable just TLS 1.1 and setting
+     can be used to disable just TLS 1.1.</br>Setting
      `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Protocols.Tls10`
-     can be used to disable TLS 1.0 on an API Management service.
+     can be used to disable TLS 1.0 on an API Management service.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls11`
+     can be used to disable just TLS 1.1 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Security.Backend.Protocols.Tls10`
+     can be used to disable TLS 1.0 for communications with
+     backends.</br>Setting
+     `Microsoft.WindowsAzure.ApiManagement.Gateway.Protocols.Server.Http2` can
+     be used to enable HTTP2 protocol on an API Management service.</br>Not
+     specifying any of these properties on PATCH operation will reset omitted
+     properties' values to their defaults. For all the settings except Http2
+     the default value is `True` if the service was created on or before April
+     1st 2018 and `False` otherwise. Http2 setting's default value is `False`.
     :type custom_properties: dict[str, str]
     :param certificates: List of Certificates that need to be installed in the
      API Management service. Max supported certificates that can be installed