diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index dad8b00beed2..a338a688ee4a 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -46,6 +46,12 @@ struct br_ip_list {
 #define BR_LEARNING_SYNC	BIT(9)
 #define BR_PROXYARP_WIFI	BIT(10)
 
+/* values as per ieee8021QBridgeFdbAgingTime */
+#define BR_MIN_AGEING_TIME	(10 * HZ)
+#define BR_MAX_AGEING_TIME	(1000000 * HZ)
+
+#define BR_DEFAULT_AGEING_TIME	(300 * HZ)
+
 extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
 
 typedef int br_should_route_hook_t(struct sk_buff *skb);
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 6ed2feb51e3c..2f81624a8257 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -391,7 +391,7 @@ void br_dev_setup(struct net_device *dev)
 	br->bridge_max_age = br->max_age = 20 * HZ;
 	br->bridge_hello_time = br->hello_time = 2 * HZ;
 	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
-	br->ageing_time = 300 * HZ;
+	br->ageing_time = BR_DEFAULT_AGEING_TIME;
 
 	br_netfilter_rtable_init(br);
 	br_stp_timer_init(br);