diff --git a/netbox/dcim/migrations/0021_add_ff_flexstack.py b/netbox/dcim/migrations/0021_add_ff_flexstack.py
new file mode 100644
index 00000000000..17fdbce3692
--- /dev/null
+++ b/netbox/dcim/migrations/0021_add_ff_flexstack.py
@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10 on 2016-10-31 16:20
+from __future__ import unicode_literals
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0020_rack_desc_units'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='device',
+            name='position',
+            field=models.PositiveSmallIntegerField(blank=True, help_text=b'The lowest-numbered unit occupied by the device', null=True, validators=[django.core.validators.MinValueValidator(1)], verbose_name=b'Position (U)'),
+        ),
+        migrations.AlterField(
+            model_name='interface',
+            name='form_factor',
+            field=models.PositiveSmallIntegerField(choices=[[b'Virtual interfaces', [[0, b'Virtual']]], [b'Ethernet (fixed)', [[800, b'100BASE-TX (10/100ME)'], [1000, b'1000BASE-T (1GE)'], [1150, b'10GBASE-T (10GE)']]], [b'Ethernet (modular)', [[1050, b'GBIC (1GE)'], [1100, b'SFP (1GE)'], [1200, b'SFP+ (10GE)'], [1300, b'XFP (10GE)'], [1310, b'XENPAK (10GE)'], [1320, b'X2 (10GE)'], [1350, b'SFP28 (25GE)'], [1400, b'QSFP+ (40GE)'], [1500, b'CFP (100GE)'], [1600, b'QSFP28 (100GE)']]], [b'FibreChannel', [[3010, b'SFP (1GFC)'], [3020, b'SFP (2GFC)'], [3040, b'SFP (4GFC)'], [3080, b'SFP+ (8GFC)'], [3160, b'SFP+ (16GFC)']]], [b'Serial', [[4000, b'T1 (1.544 Mbps)'], [4010, b'E1 (2.048 Mbps)'], [4040, b'T3 (45 Mbps)'], [4050, b'E3 (34 Mbps)']]], [b'Stacking', [[5000, b'Cisco StackWise'], [5050, b'Cisco StackWise Plus'], [5000, b'Cisco FlexStack'], [5050, b'Cisco FlexStack Plus']]], [b'Other', [[32767, b'Other']]]], default=1200),
+        ),
+        migrations.AlterField(
+            model_name='interfacetemplate',
+            name='form_factor',
+            field=models.PositiveSmallIntegerField(choices=[[b'Virtual interfaces', [[0, b'Virtual']]], [b'Ethernet (fixed)', [[800, b'100BASE-TX (10/100ME)'], [1000, b'1000BASE-T (1GE)'], [1150, b'10GBASE-T (10GE)']]], [b'Ethernet (modular)', [[1050, b'GBIC (1GE)'], [1100, b'SFP (1GE)'], [1200, b'SFP+ (10GE)'], [1300, b'XFP (10GE)'], [1310, b'XENPAK (10GE)'], [1320, b'X2 (10GE)'], [1350, b'SFP28 (25GE)'], [1400, b'QSFP+ (40GE)'], [1500, b'CFP (100GE)'], [1600, b'QSFP28 (100GE)']]], [b'FibreChannel', [[3010, b'SFP (1GFC)'], [3020, b'SFP (2GFC)'], [3040, b'SFP (4GFC)'], [3080, b'SFP+ (8GFC)'], [3160, b'SFP+ (16GFC)']]], [b'Serial', [[4000, b'T1 (1.544 Mbps)'], [4010, b'E1 (2.048 Mbps)'], [4040, b'T3 (45 Mbps)'], [4050, b'E3 (34 Mbps)']]], [b'Stacking', [[5000, b'Cisco StackWise'], [5050, b'Cisco StackWise Plus'], [5000, b'Cisco FlexStack'], [5050, b'Cisco FlexStack Plus']]], [b'Other', [[32767, b'Other']]]], default=1200),
+        ),
+    ]
diff --git a/netbox/dcim/models.py b/netbox/dcim/models.py
index 52eeb7f3a0d..449202c6eb2 100644
--- a/netbox/dcim/models.py
+++ b/netbox/dcim/models.py
@@ -107,6 +107,8 @@
 # Stacking
 IFACE_FF_STACKWISE = 5000
 IFACE_FF_STACKWISE_PLUS = 5050
+IFACE_FF_FLEXSTACK = 5100
+IFACE_FF_FLEXSTACK_PLUS = 5150
 # Other
 IFACE_FF_OTHER = 32767
 
@@ -164,6 +166,8 @@
         [
             [IFACE_FF_STACKWISE, 'Cisco StackWise'],
             [IFACE_FF_STACKWISE_PLUS, 'Cisco StackWise Plus'],
+            [IFACE_FF_STACKWISE, 'Cisco FlexStack'],
+            [IFACE_FF_STACKWISE_PLUS, 'Cisco FlexStack Plus'],
         ]
     ],
     [