diff --git a/netbox/dcim/constants.py b/netbox/dcim/constants.py
index 2a477932b..b24ba8e4f 100644
--- a/netbox/dcim/constants.py
+++ b/netbox/dcim/constants.py
@@ -95,7 +95,8 @@ IFACE_FF_FLEXSTACK_PLUS = 5150
 IFACE_FF_JUNIPER_VCP = 5200
 IFACE_FF_EXTREME_SS = 5300
 IFACE_FF_EXTREME_SS128 = 5310
-IFACE_FF_EXTREME_SS512 = 5320
+IFACE_FF_EXTREME_SS256 = 5320
+IFACE_FF_EXTREME_SS512 = 5330
 
 # Other
 IFACE_FF_OTHER = 32767
@@ -173,8 +174,9 @@ IFACE_FF_CHOICES = [
             [IFACE_FF_FLEXSTACK_PLUS, 'Cisco FlexStack Plus'],
             [IFACE_FF_JUNIPER_VCP, 'Juniper VCP'],
             [IFACE_FF_EXTREME_SS, 'Extreme SummitStack'],
-            [IFACE_FF_EXTREME_SS128, 'Extreme SummitStack128'],
-            [IFACE_FF_EXTREME_SS512, 'Extreme SummitStack512'],
+            [IFACE_FF_EXTREME_SS128, 'Extreme SummitStack-128'],
+            [IFACE_FF_EXTREME_SS128, 'Extreme SummitStack-256'],
+            [IFACE_FF_EXTREME_SS512, 'Extreme SummitStack-512'],
         ]
     ],
     [