diff --git a/check_bird2_oneshot b/check_bird2_oneshot
index ba0e78f..053f792 100755
--- a/check_bird2_oneshot
+++ b/check_bird2_oneshot
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright 2019 alarig <alarig@grifon.fr>
+# Copyright 2021 alarig <alarig@grifon.fr>
 #
 # BSD-3-Clause licence
 #
@@ -85,6 +85,16 @@ test_route_limit() {
 	fi
 }
 
+test_exstart_neigh() {
+	exstart_neighbors="$(${birdc} \
+		show ospf neighbors ${protocol_name} | grep -c ExStart)"
+	if [ "${exstart_neighbors}" -gt 0 ]; then
+		printf "${protocol_name} has " >> ${DIR}/WARNING.txt
+		printf "${exstart_neighbors} ExStart " >> ${DIR}/WARNING.txt
+		printf "neighbors\n" >> ${DIR}/WARNING.txt
+	fi
+}
+
 # path expansion for birdc and sudo of FreeBSD
 PATH="$PATH:/usr/local/sbin/:/usr/local/bin/"
 
@@ -148,6 +158,7 @@ for protocol in $(find ${DIR} -type f); do
 		# https://gitlab.labs.nic.cz/labs/bird/blob/master/proto/ospf/ospf.c#L532
 		Running)
 			test_route_limit
+			test_exstart_neigh
 			;;
 		Alone)
 			printf "${protocol_name} is in ${STATE} state\n" >> \