Added a note about dynamic device config not supported

Change-Id: I0eac01d3bba2b56918bf5e979883fd89896ae0f0
diff --git a/configuration/device-config.rst b/configuration/device-config.rst
index 6bc7e66..4337558 100644
--- a/configuration/device-config.rst
+++ b/configuration/device-config.rst
@@ -41,3 +41,11 @@
 
     - When using OpenvSwitch, set this to ``ovs-ofdpa``
     - When using hardware switches, set this to ``ofdpa3`` or eliminate ``driver`` entirely as the correct driver configuration will be set automatically by ONOS
+
+.. note::
+    Most of the Trellis configurations support dynamic configuration updates.
+    Unfortunately, Trellis currently **do not support dynamic device configuration updates**.
+    You will have to restart the device when if corresponding device configuration changes.
+
+    Having said that, when introducing a completely new device in the network,
+    the device configurations pushed before the device's connection should apply correctly.