diff --git a/sys/net/lagg/if_lagg.c b/sys/net/lagg/if_lagg.c
index e3527b269b95..735b58c5387f 100644
--- a/sys/net/lagg/if_lagg.c
+++ b/sys/net/lagg/if_lagg.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: if_lagg.c,v 1.20 2021/11/08 06:29:16 yamaguchi Exp $	*/
+/*	$NetBSD: if_lagg.c,v 1.21 2021/11/11 01:10:09 yamaguchi Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
@@ -20,7 +20,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_lagg.c,v 1.20 2021/11/08 06:29:16 yamaguchi Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_lagg.c,v 1.21 2021/11/11 01:10:09 yamaguchi Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -2091,15 +2091,21 @@ lagg_port_setsadl(struct lagg_port *lp, uint8_t *lladdr,
 		lagg_chg_sadl(ifp_port,
 		    lladdr, ETHER_ADDR_LEN);
 
-		if (!ISSET(ifp_port->if_flags, IFF_RUNNING)) {
-			break;
-		}
+		if (ifp_port->if_init != NULL) {
+			error = 0;
+			if (ISSET(ifp_port->if_flags, IFF_RUNNING))
+				error = ifp_port->if_init(ifp_port);
 
-		error = ifp_port->if_init(ifp_port);
-		if (error != 0) {
-			lagg_log(lp->lp_softc, LOG_WARNING,
-			    "%s failed to if_init() on %d\n",
-			    ifp_port->if_xname, error);
+			if (error != 0) {
+				lagg_log(lp->lp_softc, LOG_WARNING,
+				    "%s failed to if_init() on %d\n",
+				    ifp_port->if_xname, error);
+			}
+		} else {
+			if (lp->lp_promisc == false) {
+				ifpromisc_locked(ifp_port, 1);
+				lp->lp_promisc = true;
+			}
 		}
 		break;
 	default:
@@ -2131,15 +2137,21 @@ lagg_port_unsetsadl(struct lagg_port *lp)
 		lagg_chg_sadl(ifp_port,
 		    lp->lp_lladdr, ETHER_ADDR_LEN);
 
-		if (!ISSET(ifp_port->if_flags, IFF_RUNNING)) {
-			break;
-		}
+		if (ifp_port->if_init != NULL) {
+			error = 0;
+			if (ISSET(ifp_port->if_flags, IFF_RUNNING))
+				error = ifp_port->if_init(ifp_port);
 
-		error = ifp_port->if_init(ifp_port);
-		if (error != 0) {
-			lagg_log(lp->lp_softc, LOG_WARNING,
-			    "%s failed to if_init() on %d\n",
-			    ifp_port->if_xname, error);
+			if (error != 0) {
+				lagg_log(lp->lp_softc, LOG_WARNING,
+				    "%s failed to if_init() on %d\n",
+				    ifp_port->if_xname, error);
+			}
+		} else {
+			if (lp->lp_promisc == true) {
+				ifpromisc_locked(ifp_port, 0);
+				lp->lp_promisc = false;
+			}
 		}
 		break;