diff --git a/openflow_input/bsn_tlv b/openflow_input/bsn_tlv
index c4c8995..0dacf16 100644
--- a/openflow_input/bsn_tlv
+++ b/openflow_input/bsn_tlv
@@ -208,3 +208,9 @@
     uint16_t length;
     of_mac_addr_t value;
 };
+
+struct of_bsn_tlv_external_gateway_mac : of_bsn_tlv {
+    uint16_t type == 29;
+    uint16_t length;
+    of_mac_addr_t value;
+};