diff --git a/web/src/i18n/en.ts b/web/src/i18n/en.ts
index 7c13f59..4d09b69 100644
--- a/web/src/i18n/en.ts
+++ b/web/src/i18n/en.ts
@@ -335,7 +335,9 @@ const en = {
     policyTitle: "Collect policy",
     policySaved: "Policy saved",
     enabled: "Enable scheduled collect",
-    autoAddUnmatched: "Create SSH placeholder NEs for unmatched neighbors",
+    autoAddUnmatched: "Auto-add unmatched neighbors as placeholders on discover",
+    autoAddUnmatchedHint:
+      "Shared by scheduled collect and canvas discover. Off = record unmatched only, no placeholder NE. Default on.",
     intervalDays: "Interval (days)",
     interval: "Collect interval",
     intervalUnitDays: "days",
@@ -1444,7 +1446,7 @@ const en = {
     alignNeedSelection: "Select at least two nodes",
     snapGrid: "Snap to grid",
     autoLayoutDiscover: "Auto-layout after discover",
-    discoverAutoAddUnmatched: "Auto-add unmatched NEs to fabric on discover",
+    discoverAutoAddUnmatched: "Auto-add unmatched NEs as placeholders on discover",
     discoverProjectNeighbors: "Project direct neighbors onto canvas after discover",
     undo: "Undo",
     redo: "Redo",
diff --git a/web/src/i18n/zh.ts b/web/src/i18n/zh.ts
index 8975414..eb453c2 100644
--- a/web/src/i18n/zh.ts
+++ b/web/src/i18n/zh.ts
@@ -332,7 +332,8 @@ const zh = {
     policyTitle: "采集策略",
     policySaved: "策略已保存",
     enabled: "启用周期调度",
-    autoAddUnmatched: "未纳管邻居建 SSH 占位网元",
+    autoAddUnmatched: "发现时自动入库未匹配网元（占位）",
+    autoAddUnmatchedHint: "周期采集与画布单点发现共用；关闭则未匹配邻居只记未匹配、不建占位网元。默认开启。",
     intervalDays: "周期（天）",
     interval: "采集周期",
     intervalUnitDays: "天",
@@ -1437,7 +1438,7 @@ const zh = {
     alignNeedSelection: "请至少选中两个节点",
     snapGrid: "网格吸附",
     autoLayoutDiscover: "发现后自动布局",
-    discoverAutoAddUnmatched: "发现时自动入库未匹配网元",
+    discoverAutoAddUnmatched: "发现时自动入库未匹配网元（占位）",
     discoverProjectNeighbors: "发现后将直连邻居加入画布",
     undo: "撤销",
     redo: "重做",
diff --git a/web/src/pages/TopologyPage.tsx b/web/src/pages/TopologyPage.tsx
index 6679c07..6b3a7a9 100644
--- a/web/src/pages/TopologyPage.tsx
+++ b/web/src/pages/TopologyPage.tsx
@@ -40,6 +40,7 @@ import {
   createTopologyView,
   deleteTopologyFolder,
   deleteTopologyMap,
+  fetchLldpCollectDashboard,
   fetchLldpDiscoverJob,
   fetchManagedNe,
   fetchManagedNeById,
@@ -52,6 +53,7 @@ import {
   removeTopologyViewNodes,
   searchFabricNodes,
   startLldpDiscover,
+  updateLldpCollectPolicy,
   updateTopologyFolder,
   updateTopologyMap,
 } from "../services/api";
@@ -458,8 +460,8 @@ type EdgeDefaults = Record<EdgeSourceKind, EdgeDefaultStyle>;
 
 const EDGE_DEFAULTS_KEY = "netx.topology.edgeDefaults";
 const AUTO_LAYOUT_DISCOVER_KEY = "netx.topology.autoLayoutAfterDiscover";
-const DISCOVER_AUTO_ADD_KEY = "netx.topology.discoverAutoAddUnmatched";
-const DISCOVER_PROJECT_NEIGHBORS_KEY = "netx.topology.discoverProjectNeighbors";
+const DISCOVER_AUTO_ADD_KEY = "netx.topology.discoverAutoAddUnmatched.v2";
+const DISCOVER_PROJECT_NEIGHBORS_KEY = "netx.topology.discoverProjectNeighbors.v2";
 const SCALE_BUNDLE_WIDTH_KEY = "netx.topology.scaleBundleWidth";
 const CANVAS_BG_KEY = "netx.topology.canvasBg";
 const DEFAULT_CANVAS_BG = "#0f172a";
@@ -845,10 +847,10 @@ export function TopologyPage() {
   const [snapToGrid, setSnapToGrid] = useState(true);
   const [autoLayoutAfterDiscover, setAutoLayoutAfterDiscover] = useState(loadAutoLayoutAfterDiscover);
   const [discoverAutoAddUnmatched, setDiscoverAutoAddUnmatched] = useState(() =>
-    loadBoolFlag(DISCOVER_AUTO_ADD_KEY, false),
+    loadBoolFlag(DISCOVER_AUTO_ADD_KEY, true),
   );
   const [discoverProjectNeighbors, setDiscoverProjectNeighbors] = useState(() =>
-    loadBoolFlag(DISCOVER_PROJECT_NEIGHBORS_KEY, false),
+    loadBoolFlag(DISCOVER_PROJECT_NEIGHBORS_KEY, true),
   );
   const [sidebarCollapsed, setSidebarCollapsed] = useState(false);
   const [addNeOpen, setAddNeOpen] = useState(false);
@@ -1049,6 +1051,24 @@ export function TopologyPage() {
     }
   }, [mapId]);
 
+  // Keep canvas "auto placeholder" in sync with topology LLDP collect policy (shared strategy).
+  useEffect(() => {
+    let alive = true;
+    void fetchLldpCollectDashboard()
+      .then((dash) => {
+        if (!alive || !dash?.policy) return;
+        const next = Boolean(dash.policy.auto_add_unmatched);
+        setDiscoverAutoAddUnmatched(next);
+        persistBoolFlag(DISCOVER_AUTO_ADD_KEY, next);
+      })
+      .catch(() => {
+        /* keep local default */
+      });
+    return () => {
+      alive = false;
+    };
+  }, []);
+
   const neQuery = useQuery({
     queryKey: [...queryKeys.managedNeAll, "topology-add-ne", debouncedKeyword],
     queryFn: () =>
@@ -3097,6 +3117,15 @@ export function TopologyPage() {
                         const next = e.target.checked;
                         setDiscoverAutoAddUnmatched(next);
                         persistBoolFlag(DISCOVER_AUTO_ADD_KEY, next);
+                        void updateLldpCollectPolicy({ auto_add_unmatched: next })
+                          .then(() => {
+                            void queryClient.invalidateQueries({
+                              queryKey: queryKeys.lldpCollectDashboard,
+                            });
+                          })
+                          .catch(() => {
+                            /* local toggle still applies to this canvas discover */
+                          });
                       }}
                     />
                     {t("topology.discoverAutoAddUnmatched")}
diff --git a/web/src/pages/network/LldpLinksPage.tsx b/web/src/pages/network/LldpLinksPage.tsx
index 56eb072..1781a6d 100644
--- a/web/src/pages/network/LldpLinksPage.tsx
+++ b/web/src/pages/network/LldpLinksPage.tsx
@@ -338,6 +338,9 @@ export function LldpLinksPage() {
             <input type="checkbox" checked={autoAdd} onChange={(e) => setAutoAdd(e.target.checked)} />
             <span>{t("lldpLinks.autoAddUnmatched")}</span>
           </label>
+          <p className="muted" style={{ margin: "0 0 8px", gridColumn: "1 / -1" }}>
+            {t("lldpLinks.autoAddUnmatchedHint")}
+          </p>
           <label className="config-sync-policy-field">
             <span>{t("lldpLinks.interval")}</span>
             <input