diff --git a/src/sonic-yang-models/tests/yang_model_tests/yangModelTesting.py b/src/sonic-yang-models/tests/yang_model_tests/yangModelTesting.py
index d36416adcae7..e1b106a17a3f 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/yangModelTesting.py
+++ b/src/sonic-yang-models/tests/yang_model_tests/yangModelTesting.py
@@ -43,7 +43,9 @@ def __init__(self, tests, yangDir, jsonFile):
             'LeafRef': ['Leafref', 'non-existing'],
             'When': ['When condition', 'not satisfied'],
             'Pattern': ['pattern', 'does not satisfy'],
-            'None': ['']
+            'Mandatory': ['required element', 'Missing'],
+            'Verify': ['verified'],
+            'None': []
         }
 
         self.ExceptionTests = {
@@ -118,12 +120,23 @@ def __init__(self, tests, yangDir, jsonFile):
             'LOOPBACK_IPPREFIX_PORT_MUST_CONDITION_FALSE': {
                 'desc': 'Loopback Ip-prefix port-name must condition failure.',
                 'eStr': self.defaultYANGFailure['Must']
+            },
+            'INCORRECT_VLAN_NAME': {
+                'desc': 'INCORRECT VLAN_NAME FIELD IN VLAN TABLE.',
+                'eStr': self.defaultYANGFailure['Pattern']
+            }
+        }
+
+        self.SpecialTests = {
+            'ALL_VLAN_TEST': {
+                'desc': 'VLAN TEST.',
+                'eStr': self.defaultYANGFailure['None']
             }
         }
 
         self.tests = tests
         if (self.tests == None):
-            self.tests = self.ExceptionTests.keys()
+            self.tests = self.ExceptionTests.keys()+self.SpecialTests.keys()
         self.yangDir = yangDir
         self.jsonFile = jsonFile
         self.testNum = 1
@@ -166,6 +179,8 @@ def run(self):
                 test = test.strip()
                 if test in self.ExceptionTests:
                     ret = ret + self.runExceptionTest(test);
+                elif test in self.SpecialTests:
+                    ret = ret + self.runSpecialTest(test);
         except Exception as e:
             printExceptionDetails()
             raise e
@@ -224,7 +239,9 @@ def runExceptionTest(self, test):
             s = self.loadConfigData(jInput)
             eStr = self.ExceptionTests[test]['eStr']
             log.debug(eStr)
-            if (sum(1 for str in eStr if str not in s) == 0):
+            if len(eStr) == 0 and s != "":
+                raise Exception("{} in not empty".format(s))
+            elif (sum(1 for str in eStr if str not in s) == 0):
                 log.info(desc + " Passed\n")
                 return PASS
         except Exception as e:
@@ -232,6 +249,37 @@ def runExceptionTest(self, test):
         log.info(desc + " Failed\n")
         return FAIL
 
+    """
+        Run Special Tests
+    """
+    def runSpecialTest(self, test):
+        try:
+            if test == 'ALL_VLAN_TEST':
+                return self.runVlanSpecialTest(test);
+        except Exception as e:
+            printExceptionDetails()
+        log.info(desc + " Failed\n")
+        return FAIL
+
+    def runVlanSpecialTest(self, test):
+        try:
+            desc = self.SpecialTests[test]['desc']
+            self.logStartTest(desc)
+            jInput = json.loads(self.readJsonInput(test))
+            # check all Vlan from 1 to 4094
+            for i in xrange(4095):
+                vlan = 'Vlan'+str(i)
+                jInput["sonic-vlan:sonic-vlan"]["sonic-vlan:VLAN"]["VLAN_LIST"]\
+                      [0]["vlan_name"] = vlan
+                log.debug(jInput)
+                s = self.loadConfigData(json.dumps(jInput))
+                if s!="":
+                    raise Exception("{} in not empty".format(s))
+            return PASS
+        except Exception as e:
+            printExceptionDetails()
+        log.info(desc + " Failed\n")
+        return FAIL
 # End of Class
 
 """
diff --git a/src/sonic-yang-models/tests/yang_model_tests/yangTest.json b/src/sonic-yang-models/tests/yang_model_tests/yangTest.json
index 2f85d0259bfa..b42d1cf24cf2 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/yangTest.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/yangTest.json
@@ -37,6 +37,38 @@
 		}
 	},
 
+	"ALL_VLAN_TEST": {
+		"sonic-vlan:sonic-vlan": {
+			"sonic-vlan:VLAN": {
+				"VLAN_LIST": [{
+					"vlan_name": "Vlan1-4094",
+					"description": "server_vlan",
+					"dhcp_servers": [
+						"10.186.72.56"
+					],
+					"mtu": "9100",
+					"admin_status": "up"
+				}]
+			}
+		}
+	},
+
+	"INCORRECT_VLAN_NAME": {
+		"sonic-vlan:sonic-vlan": {
+			"sonic-vlan:VLAN": {
+				"VLAN_LIST": [{
+					"vlan_name": "Vlan8090",
+					"description": "server_vlan",
+					"dhcp_servers": [
+						"10.186.72.56"
+					],
+					"mtu": "9100",
+					"admin_status": "up"
+				}]
+			}
+		}
+	},
+
 	"VLAN_WITH_NON_EXIST_PORT": {
 		"sonic-vlan:sonic-vlan": {
 			"sonic-vlan:VLAN_MEMBER": {
@@ -484,6 +516,7 @@
 				"PORT_LIST": [{
 					"port_name": "Ethernet8",
 					"alias": "eth8",
+					"lanes": "65",
 					"description": "Ethernet8",
 					"speed": 25000,
 					"mtu": 9000,
@@ -492,6 +525,7 @@
 				{
 					"port_name": "Ethernet9",
 					"alias": "eth9",
+					"lanes": "71",
 					"description": "Ethernet9",
 					"speed": 25000,
 					"mtu": 9000,
@@ -520,6 +554,7 @@
 				"PORT_LIST": [{
 					"port_name": "Ethernet8",
 					"alias": "eth8",
+					"lanes": "65",
 					"description": "Ethernet8",
 					"speed": 25000,
 					"mtu": 9000,
diff --git a/src/sonic-yang-models/yang-models/sonic-vlan.yang b/src/sonic-yang-models/yang-models/sonic-vlan.yang
index 4c3aecaf8106..d05d2a39e6d8 100644
--- a/src/sonic-yang-models/yang-models/sonic-vlan.yang
+++ b/src/sonic-yang-models/yang-models/sonic-vlan.yang
@@ -128,7 +128,7 @@ module sonic-vlan {
 
 				leaf vlan_name {
 					type string {
-						pattern 'Vlan([0-9]{1,3}|[0-3][0-9]{4}|[4][0][0-8][0-9]|[4][0][9][0-4])';
+						pattern 'Vlan([0-9]{1,3}|[1-3][0-9]{3}|[4][0][0-8][0-9]|[4][0][9][0-4])';
 					}
 				}