diff --git a/inc/saihostif.h b/inc/saihostif.h
index 4ff6d52df0..24aa9c2036 100644
--- a/inc/saihostif.h
+++ b/inc/saihostif.h
@@ -251,6 +251,9 @@ typedef enum _sai_hostif_trap_type_t
      */
     SAI_HOSTIF_TRAP_TYPE_DHCPV6_L2 = 0x00000013,
 
+    /** Default action is drop */
+    SAI_HOSTIF_TRAP_TYPE_MSTP = 0x00000014,
+
     /** Switch traps custom range start */
     SAI_HOSTIF_TRAP_TYPE_SWITCH_CUSTOM_RANGE_BASE = 0x00001000,
 
diff --git a/meta/acronyms.txt b/meta/acronyms.txt
index 1eec2f254b..48c4d8f775 100644
--- a/meta/acronyms.txt
+++ b/meta/acronyms.txt
@@ -85,6 +85,7 @@ MDIO - Management Data Input/Output
 MDIX - Medium Dependent Interface Crossover
 MMU - Memory Management Unit
 MPLS - Multi Protocol Label Switching
+MSTP - Multiple Spanning Tree Protocol
 MTU - Maximum Transmission Unit
 NAPT - Network Address Port Translation
 NHLFE - Next Hop Label Forwarding Entry