diff --git a/src/backend/app/__init__.py b/src/backend/app/__init__.py
index 3963a5e..e7d731a 100644
--- a/src/backend/app/__init__.py
+++ b/src/backend/app/__init__.py
@@ -3,8 +3,8 @@ from src.backend.app.api.endpoints import router
 from src.backend.app.utils.logger import setup_logging
 from src.backend.config import settings
 
-app = FastAPI()
-app.include_router(router,prefix="/api")
+api_app = FastAPI()
+api_app.include_router(router,prefix="/api")
 
 def create_app() -> FastAPI:
     # 设置日志
diff --git a/src/backend/app/api/command_parser.py b/src/backend/app/api/command_parser.py
index 071473e..bb8288f 100644
--- a/src/backend/app/api/command_parser.py
+++ b/src/backend/app/api/command_parser.py
@@ -1,8 +1,7 @@
-from typing import Dict, Any
+from typing import Dict, Any, Optional
 from src.backend.app.services.ai_services import AIService
 from src.backend.config import settings
 
-
 class CommandParser:
     def __init__(self):
         self.ai_service = AIService(settings.SILICONFLOW_API_KEY, settings.SILICONFLOW_API_URL)
@@ -19,7 +18,8 @@ class CommandParser:
         # 本地无法解析则调用AI服务
         return await self.ai_service.parse_command(command)
 
-    def _try_local_parse(self, command: str) -> Dict[str, Any]:
+    @staticmethod
+    def _try_local_parse(command: str) -> Optional[Dict[str, Any]]:
         """
         尝试本地解析常见命令
         """
@@ -28,12 +28,13 @@ class CommandParser:
         # VLAN配置
         if "vlan" in command and "创建" in command:
             parts = command.split()
-            vlan_id = next((p for p in parts if p.isdigit()), None)
-            if vlan_id:
+            vlan_id_str = next((p for p in parts if p.isdigit()), None)
+            if vlan_id_str:
+                vlan_id = int(vlan_id_str)  # 转换为整数
                 return {
                     "type": "vlan",
-                    "vlan_id": int(vlan_id),
-                    "name": f"VLAN{vlan_id}",
+                    "vlan_id": vlan_id,  # 使用整数
+                    "name": f"VLAN{vlan_id}",  # 使用转换后的整数
                     "interfaces": []
                 }
 
@@ -60,9 +61,9 @@ class CommandParser:
                     config["description"] = description
 
                 if "vlan" in command:
-                    vlan_id = next((p for p in parts if p.isdigit()), None)
-                    if vlan_id:
-                        config["vlan"] = int(vlan_id)
+                    vlan_id_str = next((p for p in parts if p.isdigit()), None)
+                    if vlan_id_str:
+                        config["vlan"] = int(vlan_id_str)  # 转换为整数
 
                 return config
 
diff --git a/src/backend/app/api/endpoints.py b/src/backend/app/api/endpoints.py
index 7b974f6..95383ac 100644
--- a/src/backend/app/api/endpoints.py
+++ b/src/backend/app/api/endpoints.py
@@ -3,7 +3,7 @@ from typing import List, Dict
 from pydantic import BaseModel
 from ...config import settings
 from ..services.network_scanner import NetworkScanner
-from ..api.network_config import SwitchConfigurator, SwitchConfig
+from ..api.network_config import SwitchConfigurator
 
 router = APIRouter(prefix="/api", tags=["API"])
 scanner = NetworkScanner()
diff --git a/src/backend/app/api/network_config.py b/src/backend/app/api/network_config.py
index fd9b629..532bd6f 100644
--- a/src/backend/app/api/network_config.py
+++ b/src/backend/app/api/network_config.py
@@ -1,6 +1,7 @@
 import asyncio
 import logging
 import telnetlib3
+import  time
 from datetime import datetime
 from pathlib import Path
 from typing import Dict, List, Optional, Union
@@ -142,6 +143,14 @@ class SwitchConfigurator:
         except Exception as e:
             raise EnspConnectionException(f"eNSP连接失败: {str(e)}")
 
+    async def _clean_idle_connections(self):
+        """连接池清理机制"""
+        now = time.time()
+        for ip, (conn, last_used) in list(self._connection_pool.items()):
+            if now - last_used > 300:  # 5分钟空闲超时
+                conn.close()
+                del self._connection_pool[ip]
+
     async def _send_ssh_commands(self, ip: str, commands: List[str]) -> str:
         """SSH协议执行"""
         async with self.semaphore:
diff --git a/src/backend/app/experiments/network_experiment.py b/src/backend/app/experiments/network_experiment.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/app/experiments/performance_analysis.py b/src/backend/app/experiments/performance_analysis.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/app/services/ai_configurator.py b/src/backend/app/services/ai_configurator.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/app/services/ai_services.py b/src/backend/app/services/ai_services.py
index e4d0712..32e0473 100644
--- a/src/backend/app/services/ai_services.py
+++ b/src/backend/app/services/ai_services.py
@@ -58,4 +58,7 @@ class AIService:
                         return json.loads(config_str)
                     raise SiliconFlowAPIException("Invalid JSON format returned from AI")
         except httpx.HTTPError as e:
-            raise SiliconFlowAPIException(str(e))
\ No newline at end of file
+            raise SiliconFlowAPIException(
+                detail=f"API请求失败: {str(e)}",
+                status_code=e.response.status_code if hasattr(e, "response") else 500
+            )
\ No newline at end of file
diff --git a/src/backend/app/services/network_optimizer.py b/src/backend/app/services/network_optimizer.py
new file mode 100644
index 0000000..12dd902
--- /dev/null
+++ b/src/backend/app/services/network_optimizer.py
@@ -0,0 +1,36 @@
+
+import networkx as nx
+from scipy.optimize import minimize
+
+
+class NetworkOptimizer:
+    def __init__(self, devices):
+        """基于图论的网络优化模型"""
+        self.graph = self.build_topology_graph(devices)
+
+    def build_topology_graph(self, devices):
+        """构建网络拓扑图"""
+        G = nx.Graph()
+        for device in devices:
+            G.add_node(device['ip'], type=device['type'])
+        # 添加连接关系（示例）
+        G.add_edge('192.168.1.1', '192.168.1.2', bandwidth=1000)
+        return G
+
+    def optimize_path(self, source, target):
+        """计算最优路径"""
+        return nx.shortest_path(self.graph, source, target)
+
+    def bandwidth_optimization(self):
+        """带宽优化模型"""
+
+        def objective(x):
+            # 最小化最大链路利用率
+            return max(x)
+
+        constraints = (
+            {'type': 'eq', 'fun': lambda x: sum(x) - total_bandwidth}
+        )
+
+        result = minimize(objective, initial_guess, constraints=constraints)
+        return result.x
\ No newline at end of file
diff --git a/src/backend/app/utils/exceptions.py b/src/backend/app/utils/exceptions.py
index ccbd2de..c82049c 100644
--- a/src/backend/app/utils/exceptions.py
+++ b/src/backend/app/utils/exceptions.py
@@ -1,5 +1,14 @@
 from fastapi import HTTPException, status
-from typing import Optional
+
+class SiliconFlowAPIException(Exception):
+    """硅基流动API异常"""
+    def __init__(self, detail: str, status_code: int = 500):
+        self.detail = detail
+        self.status_code = status_code
+        super().__init__(detail)
+
+    def __str__(self):
+        return f"SiliconFlowAPI Error [{self.status_code}]: {self.detail}"
 
 class AICommandParseException(HTTPException):
     def __init__(self, detail: str):
@@ -23,9 +32,9 @@ class ConfigBackupException(SwitchConfigException):
     """配置备份失败异常"""
     def __init__(self, ip: str):
         super().__init__(
-            detail=f"无法备份设备 {ip} 的配置",
-            recovery_guide="检查设备存储空间或权限"
+            detail=f"无法备份设备 {ip} 的配置"
         )
+        self.recovery_guide = "检查设备存储空间或权限"  # 在子类中存储恢复指南
 
 class ConfigRollbackException(SwitchConfigException):
     """回滚失败异常"""
@@ -34,3 +43,4 @@ class ConfigRollbackException(SwitchConfigException):
             detail=f"设备 {ip} 回滚失败（原始错误：{original_error}）",
             status_code=status.HTTP_422_UNPROCESSABLE_ENTITY
         )
+        self.recovery_guide = "尝试手动恢复配置或重启设备"
\ No newline at end of file
diff --git a/src/backend/app/utils/visualization/performance_dashboard.py b/src/backend/app/utils/visualization/performance_dashboard.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/app/utils/visualization/topology_3d.py b/src/backend/app/utils/visualization/topology_3d.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/backend/batch/bulk_config.py b/src/backend/batch/bulk_config.py
index ea38b67..7847b60 100644
--- a/src/backend/batch/bulk_config.py
+++ b/src/backend/batch/bulk_config.py
@@ -24,8 +24,8 @@ class BulkConfigurator:
             return "\n".join(r.stdout for r in results)
         finally:
             await self.pool.release_connection(ip, conn)
-
-    def _generate_commands(self, config: BulkSwitchConfig) -> List[str]:
+    @staticmethod
+    def _generate_commands(config: BulkSwitchConfig) -> List[str]:
         """命令生成（纯业务逻辑）"""
         commands = []
         if config.vlan_id:
diff --git a/src/backend/batch/connection_pool.py b/src/backend/batch/connection_pool.py
index c29ee31..f314fb2 100644
--- a/src/backend/batch/connection_pool.py
+++ b/src/backend/batch/connection_pool.py
@@ -1,9 +1,7 @@
 import asyncio
-import time
 import asyncssh
 from typing import Dict
 
-
 class SwitchConnectionPool:
     """
     交换机连接池（支持自动重连和负载均衡）
@@ -35,10 +33,15 @@ class SwitchConnectionPool:
 
     async def release_connection(self, ip: str, conn: asyncssh.SSHClientConnection):
         async with self._lock:
-            if conn.is_connected() and self._pools[ip].qsize() < self._max_conn:
+            if hasattr(conn, 'is_closed') and not conn.is_closed() and self._pools[ip].qsize() < self._max_conn:
+                await self._pools[ip].put(conn)
+            elif hasattr(conn, 'closed') and not conn.closed and self._pools[ip].qsize() < self._max_conn:
                 await self._pools[ip].put(conn)
             else:
-                conn.close()
+                try:
+                    conn.close()
+                except:
+                    pass
 
     async def close_all(self):
         async with self._lock:
diff --git a/src/backend/requirements.txt b/src/backend/requirements.txt
index 33a2ee0..fc90248 100644
--- a/src/backend/requirements.txt
+++ b/src/backend/requirements.txt
@@ -11,4 +11,9 @@ typing-extensions>=4.0.0
 aiofiles>=24.1.0
 telnetlib3>=2.0.4
 asyncssh>=2.14.0
-aiofiles>=24.1.0
\ No newline at end of file
+aiofiles>=24.1.0
+networkx==3.1
+scipy==1.11.1
+stable-baselines3==2.0.0
+plotly==5.15.0
+pandas==2.0.3
\ No newline at end of file