diff --git a/generic_config_updater/gu_common.py b/generic_config_updater/gu_common.py
index 938aa1d034..452bad1ee7 100644
--- a/generic_config_updater/gu_common.py
+++ b/generic_config_updater/gu_common.py
@@ -239,7 +239,8 @@ def validate_lanes(self, config_db):
             for port in port_to_lanes_map:
                 lanes = port_to_lanes_map[port]
                 for lane in lanes:
-                    if lane in existing:
+                    # default lane would be 0, it does not need validate duplication.
+                    if lane in existing and lane != '0':
                         return False, f"'{lane}' lane is used multiple times in PORT: {set([port, existing[lane]])}"
                     existing[lane] = port
         return True, None
diff --git a/tests/generic_config_updater/gu_common_test.py b/tests/generic_config_updater/gu_common_test.py
index 4a16a5ca4f..21f50e0b7b 100644
--- a/tests/generic_config_updater/gu_common_test.py
+++ b/tests/generic_config_updater/gu_common_test.py
@@ -361,6 +361,13 @@ def test_validate_lanes__same_valid_lanes_multi_ports_no_spaces__failure(self):
             }}
         self.validate_lanes(config, '67')
 
+    def test_validate_lanes_default_value_duplicate_check(self):
+        config = {"PORT": {
+            "Ethernet0": {"lanes": "0", "speed": "10000"},
+            "Ethernet1": {"lanes": "0", "speed": "10000"},
+            }}
+        self.validate_lanes(config)
+
     def validate_lanes(self, config_db, expected_error=None):
         # Arrange
         config_wrapper = gu_common.ConfigWrapper()