Index: sbin/ifconfig/iflagg.c
===================================================================
--- sbin/ifconfig/iflagg.c
+++ sbin/ifconfig/iflagg.c
@@ -114,10 +114,13 @@
 	
 	bzero(&ro, sizeof(ro));
 	strlcpy(ro.ro_ifname, name, sizeof(ro.ro_ifname));
-	ro.ro_bkt = (int)strtol(val, NULL, 10);
+	ro.ro_opts = LAGG_OPT_RR_LIMIT;
+	ro.ro_bkt = (uint32_t)strtoul(val, NULL, 10);
+	if (ro.ro_bkt == 0)
+		errx(1, "Invalid round-robin stride: %s", val);
 
 	if (ioctl(s, SIOCSLAGGOPTS, &ro) != 0)
-		err(1, "SIOCSLAGG");
+		err(1, "SIOCSLAGGOPTS");
 }
 
 static void
Index: sys/net/if_lagg.h
===================================================================
--- sys/net/if_lagg.h
+++ sys/net/if_lagg.h
@@ -63,11 +63,11 @@
 
 #define	LAGG_PROTO_DEFAULT	LAGG_PROTO_FAILOVER
 #define LAGG_PROTOS	{						\
-	{ "failover",		LAGG_PROTO_FAILOVER },		\
+	{ "failover",		LAGG_PROTO_FAILOVER },			\
 	{ "lacp",		LAGG_PROTO_LACP },			\
 	{ "loadbalance",	LAGG_PROTO_LOADBALANCE },		\
-	{ "roundrobin",	LAGG_PROTO_ROUNDROBIN },		\
-	{ "broadcast",	LAGG_PROTO_BROADCAST },		\
+	{ "roundrobin",		LAGG_PROTO_ROUNDROBIN },		\
+	{ "broadcast",		LAGG_PROTO_BROADCAST },			\
 	{ "none",		LAGG_PROTO_NONE },			\
 	{ "default",		LAGG_PROTO_DEFAULT }			\
 }
@@ -149,6 +149,7 @@
 #define	LAGG_OPT_LACP_TXTEST		0x20		/* LACP debug: txtest */
 #define	LAGG_OPT_LACP_RXTEST		0x40		/* LACP debug: rxtest */
 #define	LAGG_OPT_LACP_TIMEOUT		0x80		/* LACP timeout */
+#define	LAGG_OPT_RR_LIMIT		0x100		/* RR stride */
 	u_int			ro_count;		/* number of ports */
 	u_int			ro_active;		/* active port count */
 	u_int			ro_flapping;		/* number of flapping */
Index: sys/net/if_lagg.c
===================================================================
--- sys/net/if_lagg.c
+++ sys/net/if_lagg.c
@@ -1257,21 +1257,18 @@
 
 		/*
 		 * The stride option was added without defining a corresponding
-		 * LAGG_OPT flag, so we must handle it before processing any
-		 * remaining options.
+		 * LAGG_OPT flag, so handle a non-zero value before checking
+		 * anything else to preserve compatibility.
 		 */
 		LAGG_XLOCK(sc);
-		if (ro->ro_bkt != 0) {
+		if (ro->ro_opts == 0 && ro->ro_bkt != 0) {
 			if (sc->sc_proto != LAGG_PROTO_ROUNDROBIN) {
 				LAGG_XUNLOCK(sc);
 				error = EINVAL;
 				break;
 			}
 			sc->sc_stride = ro->ro_bkt;
-		} else {
-			sc->sc_stride = 0;
 		}
-
 		if (ro->ro_opts == 0) {
 			LAGG_XUNLOCK(sc);
 			break;
@@ -1289,6 +1286,7 @@
 		case LAGG_OPT_USE_NUMA:
 		case -LAGG_OPT_USE_NUMA:
 		case LAGG_OPT_FLOWIDSHIFT:
+		case LAGG_OPT_RR_LIMIT:
 			valid = 1;
 			lacp = 0;
 			break;
@@ -1314,14 +1312,23 @@
 			LAGG_XUNLOCK(sc);
 			break;	/* Return from SIOCSLAGGOPTS. */ 
 		}
+
 		/*
 		 * Store new options into sc->sc_opts except for
-		 * FLOWIDSHIFT and LACP options.
+		 * FLOWIDSHIFT, RR and LACP options.
 		 */
 		if (lacp == 0) {
 			if (ro->ro_opts == LAGG_OPT_FLOWIDSHIFT)
 				sc->flowid_shift = ro->ro_flowid_shift;
-			else if (ro->ro_opts > 0)
+			else if (ro->ro_opts == LAGG_OPT_RR_LIMIT) {
+				if (sc->sc_proto != LAGG_PROTO_ROUNDROBIN ||
+				    ro->ro_bkt == 0) {
+					error = EINVAL;
+					LAGG_XUNLOCK(sc);
+					break;
+				}
+				sc->sc_stride = ro->ro_bkt;
+			} else if (ro->ro_opts > 0)
 				sc->sc_opts |= ro->ro_opts;
 			else
 				sc->sc_opts &= ~ro->ro_opts;
@@ -2046,6 +2053,7 @@
 lagg_rr_attach(struct lagg_softc *sc)
 {
 	sc->sc_seq = 0;
+	sc->sc_stride = 1;
 }
 
 static int
@@ -2055,9 +2063,7 @@
 	uint32_t p;
 
 	p = atomic_fetchadd_32(&sc->sc_seq, 1);
-	if (sc->sc_stride > 0)
-		p /= sc->sc_stride;
-
+	p /= sc->sc_stride;
 	p %= sc->sc_count;
 	lp = CK_SLIST_FIRST(&sc->sc_ports);