test

config/plans.json

 [
   {
-    "id": 1800,
+    "id": 3,
     "routers": [
       1,
       3

src/Router.ts

@@ -38,7 +38,7 @@ export class Router {
       this.via.set(router, router);
     }
     for (const plan of plans.filter(plan => !plan.routers.includes(this.id))) {
-      this.plan[plan.id] = Router.all.find(r => r.id == plan.routers[0])!.id;
+      this.plan[plan.id] = this.id;
     }
   }
 
@@ -112,19 +112,22 @@ export class Router {
       }
     }
 
-    const changedPlan: Record<number, number | null> = {};
+
+    // 计算 route plan
+    // 凡是自己可以作为那个 plan 出口的，是不会计算直接跳过的，所以这里有 plan 到自己的意思是，没有找到任何一个通的可以出的地方，所以只好从自己出了
+    const changedPlan: Record<number, number> = {};
     for (const plan of plans.filter(plan => !plan.routers.includes(this.id))) {
       const currentPlan = this.plan[plan.id];
-      const currentMetric =
+      const currentMetric = currentPlan === this.id ? Infinity : metric[currentPlan];
       const items = plan.routers.map(to => [to, metric[to]]);
       const [bestPlan, bestMetric] = _.minBy(items, ([t, m]) => m)!;
 
-      if (bestMetric === Infinity) {
-        changedPlan[plan.id] = null;
-      } else {
+      if (currentPlan !== this.id && bestMetric === Infinity) {
+        // 原来通的，现在不通了
+        changedPlan[plan.id] = this.id;
+      } else if (currentPlan !== bestPlan && bestMetric + config.throttle < currentMetric) {
         changedPlan[plan.id] = bestPlan;
       }
-
     }
 
     if (!_.isEmpty(changedVia) || !_.isEmpty(changedPlan)) {