diff --git a/napalm_base/base.py b/napalm_base/base.py
index 01e1aa69..6e16a442 100644
--- a/napalm_base/base.py
+++ b/napalm_base/base.py
@@ -796,6 +796,7 @@ def get_interfaces_ip(self):
         addresses as keys.
         Each IP Address dictionary has the following keys:
             * prefix_length (int)
+            * primary_ip (boolean)
 
         Example::
 
@@ -803,35 +804,46 @@ def get_interfaces_ip(self):
                 u'FastEthernet8': {
                     u'ipv4': {
                         u'10.66.43.169': {
-                            'prefix_length': 22
+                            'prefix_length': 22,
+                            'primary_ip': True
+                        },
+                        u'10.66.50.1': {
+                            'prefix_length': 24,
+                            'primary_ip': False
                         }
                     }
                 },
                 u'Loopback555': {
                     u'ipv4': {
                         u'192.168.1.1': {
-                            'prefix_length': 24
+                            'prefix_length': 24,
+                            'primary_ip': True
                         }
                     },
                     u'ipv6': {
                         u'1::1': {
-                            'prefix_length': 64
+                            'prefix_length': 64,
+                            'primary_ip': False
                         },
                         u'2001:DB8:1::1': {
-                            'prefix_length': 64
+                            'prefix_length': 64,
+                            'primary_ip': True
                         },
                         u'2::': {
-                            'prefix_length': 64
+                            'prefix_length': 64,
+                            'primary_ip': False
                         },
                         u'FE80::3': {
-                            'prefix_length': u'N/A'
+                            'prefix_length': u'N/A',
+                            'primary_ip': False
                         }
                     }
                 },
                 u'Tunnel0': {
                     u'ipv4': {
                         u'10.63.100.9': {
-                            'prefix_length': 24
+                            'prefix_length': 24,
+                            'primary_ip': True
                         }
                     }
                 }
diff --git a/napalm_base/test/models.py b/napalm_base/test/models.py
index 37bd84ff..2f783e2b 100644
--- a/napalm_base/test/models.py
+++ b/napalm_base/test/models.py
@@ -197,7 +197,8 @@
 }
 
 interfaces_ip = {
-    'prefix_length': int
+    'prefix_length': int,
+    'primary_key': bool
 }
 
 mac_address_table = {