diff --git a/db.py b/db.py
index 90cb80f..a84ea1d 100644
--- a/db.py
+++ b/db.py
@@ -96,19 +96,32 @@ def upsert_switch(chassis_id, hostname, mgmt_ip, description, firmware='', vendo
     conn.close()
 
 
+def _port_num(port):
+    """Trailing port digit(s): 'Gi1/9' → '9', 'Te1/10' → '10', '9' → '9'."""
+    m = re.search(r'(\d+)$', (port or '').strip())
+    return m.group(1) if m else (port or '').strip()
+
+
 def upsert_link(chassis_a, port_a, chassis_b, port_b):
     # Normalize order so A→B and B→A are treated as the same link
     if chassis_a > chassis_b:
         chassis_a, chassis_b = chassis_b, chassis_a
         port_a, port_b = port_b, port_a
     conn = get_conn()
-    # Check both orderings before inserting
+    # Exact match first
     existing = conn.execute("""
-        SELECT id FROM links WHERE
-            (chassis_a=? AND port_a=? AND chassis_b=? AND port_b=?) OR
-            (chassis_a=? AND port_a=? AND chassis_b=? AND port_b=?)
-    """, (chassis_a, port_a, chassis_b, port_b,
-             chassis_b, port_b, chassis_a, port_a)).fetchone()
+        SELECT id FROM links WHERE chassis_a=? AND port_a=? AND chassis_b=? AND port_b=?
+    """, (chassis_a, port_a, chassis_b, port_b)).fetchone()
+    if not existing:
+        # Fuzzy match: same chassis pair, same trailing port numbers
+        # handles 'Gi1/9' vs '9' reported by different vendors for the same cable
+        rows = conn.execute("""
+            SELECT port_a, port_b FROM links WHERE chassis_a=? AND chassis_b=?
+        """, (chassis_a, chassis_b)).fetchall()
+        for r in rows:
+            if _port_num(port_a) == _port_num(r[0]) and _port_num(port_b) == _port_num(r[1]):
+                existing = True
+                break
     if not existing:
         conn.execute("""
             INSERT OR IGNORE INTO links (chassis_a, port_a, chassis_b, port_b)