diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index dad8b00..a338a68 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -46,6 +46,12 @@
 #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);