diff --git a/envoy/admin/v2alpha/server_info.proto b/envoy/admin/v2alpha/server_info.proto
index c68af00d..171c6c69 100644
--- a/envoy/admin/v2alpha/server_info.proto
+++ b/envoy/admin/v2alpha/server_info.proto
@@ -17,6 +17,10 @@ message ServerInfo {
     LIVE = 0;
     // Server is draining listeners in response to external health checks failing.
     DRAINING = 1;
+    // Server has not yet completed cluster manager initialization.
+    PRE_INITIALIZING = 2;
+    // Server is running the cluster manager initialization callbacks (e.g., RDS).
+    INITIALIZING = 3;
   }
 
   // State of the server.