Index: sbin/ifconfig/ifconfig.8
===================================================================
--- sbin/ifconfig/ifconfig.8
+++ sbin/ifconfig/ifconfig.8
@@ -2396,6 +2396,10 @@
 Set a shift parameter for RSS local hash computation.
 Hash is calculated by using flowid bits in a packet header mbuf
 which are shifted by the number of this parameter.
+.It Cm lacp_fast_timeout
+Enable lacp fast-timeout on the interface.
+.It Cm -lacp_fast_timeout
+Disable lacp fast-timeout on the interface.
 .El
 .Pp
 The following parameters are specific to IP tunnel interfaces,
Index: sbin/ifconfig/iflagg.c
===================================================================
--- sbin/ifconfig/iflagg.c
+++ sbin/ifconfig/iflagg.c
@@ -115,6 +115,8 @@
 	case -LAGG_OPT_LACP_TXTEST:
 	case LAGG_OPT_LACP_RXTEST:
 	case -LAGG_OPT_LACP_RXTEST:
+	case LAGG_OPT_LACP_TIMEOUT:
+	case -LAGG_OPT_LACP_TIMEOUT:
 		break;
 	default:
 		err(1, "Invalid lagg option");
@@ -293,6 +295,8 @@
 	DEF_CMD("-lacp_txtest",	-LAGG_OPT_LACP_TXTEST,	setlaggsetopt),
 	DEF_CMD("lacp_rxtest",	LAGG_OPT_LACP_RXTEST,	setlaggsetopt),
 	DEF_CMD("-lacp_rxtest",	-LAGG_OPT_LACP_RXTEST,	setlaggsetopt),
+	DEF_CMD("lacp_fast_timeout",	LAGG_OPT_LACP_TIMEOUT,	setlaggsetopt),
+	DEF_CMD("-lacp_fast_timeout",	-LAGG_OPT_LACP_TIMEOUT,	setlaggsetopt),
 	DEF_CMD_ARG("flowid_shift",	setlaggflowidshift),
 };
 static struct afswtch af_lagg = {
Index: sys/net/ieee8023ad_lacp.h
===================================================================
--- sys/net/ieee8023ad_lacp.h
+++ sys/net/ieee8023ad_lacp.h
@@ -251,6 +251,7 @@
 		u_int32_t	lsc_tx_test;
 	} lsc_debug;
 	u_int32_t		lsc_strict_mode;
+	boolean_t		lsc_fast_timeout; /* if set, fast timeout */
 };
 
 #define	LACP_TYPE_ACTORINFO	1
Index: sys/net/ieee8023ad_lacp.c
===================================================================
--- sys/net/ieee8023ad_lacp.c
+++ sys/net/ieee8023ad_lacp.c
@@ -522,7 +522,7 @@
 	int error;
 
 	boolean_t active = TRUE; /* XXX should be configurable */
-	boolean_t fast = FALSE; /* XXX should be configurable */
+	boolean_t fast = FALSE; /* Configurable via ioctl */ 
 
 	link_init_sdl(ifp, (struct sockaddr *)&sdl, IFT_ETHER);
 	sdl.sdl_alen = ETHER_ADDR_LEN;
Index: sys/net/if_lagg.h
===================================================================
--- sys/net/if_lagg.h
+++ sys/net/if_lagg.h
@@ -150,6 +150,7 @@
 #define	LAGG_OPT_LACP_STRICT		0x10		/* LACP strict mode */
 #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 */
 	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
@@ -1257,6 +1257,8 @@
 				ro->ro_opts |= LAGG_OPT_LACP_RXTEST;
 			if (lsc->lsc_strict_mode != 0)
 				ro->ro_opts |= LAGG_OPT_LACP_STRICT;
+			if (lsc->lsc_fast_timeout != 0)
+				ro->ro_opts |= LAGG_OPT_LACP_TIMEOUT;
 
 			ro->ro_active = sc->sc_active;
 		} else {
@@ -1292,6 +1294,8 @@
 		case -LAGG_OPT_LACP_RXTEST:
 		case LAGG_OPT_LACP_STRICT:
 		case -LAGG_OPT_LACP_STRICT:
+		case LAGG_OPT_LACP_TIMEOUT:
+		case -LAGG_OPT_LACP_TIMEOUT:
 			valid = lacp = 1;
 			break;
 		default:
@@ -1320,6 +1324,7 @@
 				sc->sc_opts &= ~ro->ro_opts;
 		} else {
 			struct lacp_softc *lsc;
+			struct lacp_port *lp;
 
 			lsc = (struct lacp_softc *)sc->sc_psc;
 
@@ -1342,6 +1347,20 @@
 			case -LAGG_OPT_LACP_STRICT:
 				lsc->lsc_strict_mode = 0;
 				break;
+			case LAGG_OPT_LACP_TIMEOUT:
+				LACP_LOCK(lsc);
+        			LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
+                        		lp->lp_state |= LACP_STATE_TIMEOUT;
+				LACP_UNLOCK(lsc);
+				lsc->lsc_fast_timeout = 1;
+				break;
+			case -LAGG_OPT_LACP_TIMEOUT:
+				LACP_LOCK(lsc);
+        			LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
+                        		lp->lp_state &= ~LACP_STATE_TIMEOUT;
+				LACP_UNLOCK(lsc);
+				lsc->lsc_fast_timeout = 0;
+				break;
 			}
 		}
 		LAGG_WUNLOCK(sc);