diff --git a/src/sonic-yang-models/doc/Configuration.md b/src/sonic-yang-models/doc/Configuration.md
index 90e0292ff8..0b850ccea7 100644
--- a/src/sonic-yang-models/doc/Configuration.md
+++ b/src/sonic-yang-models/doc/Configuration.md
@@ -1611,7 +1611,8 @@ These tables have a number of shared attributes as described below:
     "VLAN_SUB_INTERFACE": {
         "Ethernet0.555": {
             "vrf_name": "Blue",
-            "vlan": "555"
+            "vlan": "555",
+            "ipv6_use_link_local_only": "enable"
         }
     }
 }
diff --git a/src/sonic-yang-models/tests/files/sample_config_db.json b/src/sonic-yang-models/tests/files/sample_config_db.json
index 3f683c3b99..99927ef909 100644
--- a/src/sonic-yang-models/tests/files/sample_config_db.json
+++ b/src/sonic-yang-models/tests/files/sample_config_db.json
@@ -1280,7 +1280,8 @@
         "VLAN_SUB_INTERFACE": {
             "Ethernet12.10": {
                 "admin_status": "up",
-                "loopback_action": "drop"
+                "loopback_action": "drop",
+                "ipv6_use_link_local_only": "enable"
             },
             "Ethernet12.10|10.0.1.56/31": {},
             "Ethernet12.10|fc00::1:71/126": {},
diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests/vlan_sub_interface.json b/src/sonic-yang-models/tests/yang_model_tests/tests/vlan_sub_interface.json
index 2806d006a8..c78574049d 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests/vlan_sub_interface.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests/vlan_sub_interface.json
@@ -71,7 +71,14 @@
         "desc": "Configure PortChannel VLAN sub interface with VNET reference."
     },
     "VLAN_SUB_INTERFACE_WITH_MISSING_VNET": {
-        "desc": "Configure VLAN sub interface with VNET reference but no VNET exsiting.",
+        "desc": "Configure VLAN sub interface with VNET reference but no VNET existing.",
         "eStrKey": "LeafRef"
+    },
+    "VLAN_SUB_INTERFACE_ENABLE_IPV6_LINK_LOCAL": {
+        "desc": "Configure VLAN sub interface with ipv6_use_link_local_only enabled."
+    },
+    "VLAN_SUB_INTERFACE_INVALID_IPV6_LINK_LOCAL": {
+        "desc": "Configure VLAN sub interface with an invalid ipv6_use_link_local_only value.",
+        "eStr": "Invalid value \"true\" in \"ipv6_use_link_local_only\" element."
     }
 }
diff --git a/src/sonic-yang-models/tests/yang_model_tests/tests_config/vlan_sub_interface.json b/src/sonic-yang-models/tests/yang_model_tests/tests_config/vlan_sub_interface.json
index 36371e691d..64a2b48313 100644
--- a/src/sonic-yang-models/tests/yang_model_tests/tests_config/vlan_sub_interface.json
+++ b/src/sonic-yang-models/tests/yang_model_tests/tests_config/vlan_sub_interface.json
@@ -779,5 +779,59 @@
                 ]
             }
         }
+    },
+    "VLAN_SUB_INTERFACE_ENABLE_IPV6_LINK_LOCAL": {
+        "sonic-vlan-sub-interface:sonic-vlan-sub-interface": {
+            "sonic-vlan-sub-interface:VLAN_SUB_INTERFACE": {
+                "VLAN_SUB_INTERFACE_LIST": [
+                    {
+                        "name": "Ethernet8.10",
+                        "ipv6_use_link_local_only": "enable"
+                    }
+                ]
+            }
+        },
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "admin_status": "up",
+                        "alias": "Ethernet8/1",
+                        "description": "Ethernet8",
+                        "lanes": "45,46,47,48",
+                        "mtu": 9000,
+                        "speed": 100000
+                    }
+                ]
+            }
+        }
+    },
+    "VLAN_SUB_INTERFACE_INVALID_IPV6_LINK_LOCAL": {
+        "sonic-vlan-sub-interface:sonic-vlan-sub-interface": {
+            "sonic-vlan-sub-interface:VLAN_SUB_INTERFACE": {
+                "VLAN_SUB_INTERFACE_LIST": [
+                    {
+                        "name": "Ethernet8.10",
+                        "ipv6_use_link_local_only": "true"
+                    }
+                ]
+            }
+        },
+        "sonic-port:sonic-port": {
+            "sonic-port:PORT": {
+                "PORT_LIST": [
+                    {
+                        "name": "Ethernet8",
+                        "admin_status": "up",
+                        "alias": "Ethernet8/1",
+                        "description": "Ethernet8",
+                        "lanes": "45,46,47,48",
+                        "mtu": 9000,
+                        "speed": 100000
+                    }
+                ]
+            }
+        }
     }
 }
diff --git a/src/sonic-yang-models/yang-models/sonic-vlan-sub-interface.yang b/src/sonic-yang-models/yang-models/sonic-vlan-sub-interface.yang
index 720cc84355..edeb330ad3 100644
--- a/src/sonic-yang-models/yang-models/sonic-vlan-sub-interface.yang
+++ b/src/sonic-yang-models/yang-models/sonic-vlan-sub-interface.yang
@@ -28,9 +28,13 @@ module sonic-vlan-sub-interface {
 
     description "VLAN sub interface for SONiC OS";
 
-	revision 2025-03-06 {
-		description "Add leaf vnet_name";
-	}
+    revision 2026-07-20 {
+        description "Add leaf ipv6_use_link_local_only";
+    }
+
+    revision 2025-03-06 {
+        description "Add leaf vnet_name";
+    }
     
     revision 2021-11-11 {
         description "Initial version";
@@ -89,6 +93,12 @@ module sonic-vlan-sub-interface {
                     }   
                 }
 
+                leaf ipv6_use_link_local_only {
+                    description "Enable/Disable IPv6 link local address on vlan sub-interface";
+                    type stypes:mode-status;
+                    default disable;
+                }
+
                 leaf loopback_action {
                     description "Packet action when a packet ingress and gets routed on the same IP interface";
                     type stypes:loopback_action;