+#define L2FIB_MEMORY_SIZE (512<<20)
+
+/* Ager scan interval is 1 minute for aging */
+#define L2FIB_AGE_SCAN_INTERVAL (60.0)
+
+/* MAC event scan delay is 100 msec unless specified by MAC event client */
+#define L2FIB_EVENT_SCAN_DELAY_DEFAULT (0.1)
+
+/* Max MACs in a event message is 100 unless specified by MAC event client */
+#define L2FIB_EVENT_MAX_MACS_DEFAULT (100)
+
+/* MAC event learn limit is 1000 unless specified by MAC event client */
+#define L2FIB_EVENT_LEARN_LIMIT_DEFAULT (1000)
+
+typedef struct
+{
+
+ /* hash table */
+ BVT (clib_bihash) mac_table;
+
+ /* per swif vector of sequence number for interface based flush of MACs */
+ u8 *swif_seq_num;
+
+ /* last event or ager scan duration */
+ f64 evt_scan_duration;
+ f64 age_scan_duration;
+
+ /* delay between event scans, default to 100 msec */
+ f64 event_scan_delay;
+
+ /* max macs in evet message, default to 100 entries */
+ u32 max_macs_in_event;
+
+ /* convenience variables */
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+} l2fib_main_t;
+
+extern l2fib_main_t l2fib_main;