diff --git a/config.c b/config.c
index 57d5f4f..7914ba4 100644
--- a/config.c
+++ b/config.c
@@ -218,6 +218,7 @@ struct config_item config_tab[] = {
 	PORT_ITEM_INT("hybrid_e2e", 0, 0, 1),
 	PORT_ITEM_INT("ignore_transport_specific", 0, 0, 1),
 	PORT_ITEM_INT("ingressLatency", 0, INT_MIN, INT_MAX),
+	PORT_ITEM_INT("inhibit_multicast_service", 0, 0, 1),
 	GLOB_ITEM_INT("initial_delay", 0, 0, INT_MAX),
 	GLOB_ITEM_INT("kernel_leap", 1, 0, 1),
 	PORT_ITEM_INT("logAnnounceInterval", 1, INT8_MIN, INT8_MAX),
diff --git a/configs/default.cfg b/configs/default.cfg
index 00ec61f..c5a8b57 100644
--- a/configs/default.cfg
+++ b/configs/default.cfg
@@ -39,6 +39,7 @@ logging_level		6
 path_trace_enabled	0
 follow_up_info		0
 hybrid_e2e		0
+inhibit_multicast_service	0
 net_sync_monitor	0
 tc_spanning_tree	0
 tx_timestamp_timeout	1
diff --git a/port.c b/port.c
index fea60db..e85f9fa 100644
--- a/port.c
+++ b/port.c
@@ -1329,6 +1329,9 @@ int port_tx_announce(struct port *p, struct address *dst)
 	struct ptp_message *msg;
 	int err;
 
+	if (p->inhibit_multicast_service && !dst) {
+		return 0;
+	}
 	if (!port_capable(p)) {
 		return 0;
 	}
@@ -1395,6 +1398,9 @@ int port_tx_sync(struct port *p, struct address *dst)
 		return -1;
 	}
 
+	if (p->inhibit_multicast_service && !dst) {
+		return 0;
+	}
 	if (!port_capable(p)) {
 		return 0;
 	}
diff --git a/port_private.h b/port_private.h
index df6cb72..19d1d7b 100644
--- a/port_private.h
+++ b/port_private.h
@@ -137,6 +137,7 @@ struct port {
 	struct unicast_master_table *unicast_master_table;
 	/* unicast service mode */
 	struct unicast_service *unicast_service;
+	int inhibit_multicast_service;
 };
 
 #define portnum(p) (p->portIdentity.portNumber)
diff --git a/unicast_service.c b/unicast_service.c
index d084711..ad0e06a 100644
--- a/unicast_service.c
+++ b/unicast_service.c
@@ -417,6 +417,8 @@ int unicast_service_initialize(struct port *p)
 		free(p->unicast_service);
 		return -1;
 	}
+	p->inhibit_multicast_service =
+		config_get_int(cfg, p->name, "inhibit_multicast_service");
 
 	return 0;
 }