diff --git a/agent/src/core_data.h b/agent/src/core_data.h
index d44ed52..d0761c5 100644
--- a/agent/src/core_data.h
+++ b/agent/src/core_data.h
@@ -249,5 +249,7 @@
 
 extern bcmos_fastlock data_lock;
 
-
+// Interface name on which grpc server is running on
+// and this can be used to get the mac adress based on interface name.
+extern char* grpc_server_interface_name;
 #endif // OPENOLT_CORE_DATA_H_