Debug: 增强拓扑构建调试日志和MAC地址标准化

- 打印所有设备的MAC地址数据库
- 详细输出每个邻居的匹配过程
- 添加normalizeMAC函数标准化MAC地址格式
- 解决MAC地址格式不一致导致匹配失败的问题

internal/topology/builder.go

@@ -2,6 +2,7 @@ package topology
 
 import (
 	"fmt"
+	"strings"
 	"network-topology-discovery/pkg/models"
 )
 
@@ -54,24 +55,44 @@ func (b *Builder) Build() models.TopologyGraph {
 
 	// 构建边(基于邻居信息)
 	edgeMap := make(map[string]bool) // 用于去重
+	
+	// 打印所有设备的MAC地址，用于调试
+	fmt.Println("\n========== MAC Address Database ==========")
+	for _, d := range b.devices {
+		if len(d.MACAddresses) > 0 {
+			fmt.Printf("Device %s (%s): %d MAC addresses\n", d.Hostname, d.IP, len(d.MACAddresses))
+			for i, mac := range d.MACAddresses {
+				if i < 5 { // 只打印前5个
+					fmt.Printf("  MAC[%d]: %s\n", i, mac)
+				}
+			}
+			if len(d.MACAddresses) > 5 {
+				fmt.Printf("  ... and %d more\n", len(d.MACAddresses)-5)
+			}
+		}
+	}
+	fmt.Println("==========================================\n")
+	
 	for _, device := range b.devices {
 		fmt.Printf("Building edges for device %s: %d neighbors, %d MAC addresses\n",
 			device.IP, len(device.Neighbors), len(device.MACAddresses))
 		
 		for _, neighbor := range device.Neighbors {
+			fmt.Printf("  Processing neighbor on %s: RemoteMAC=%s, RemoteDevice=%s, RemoteIP=%s\n",
+				neighbor.LocalInterface, neighbor.RemoteMAC, neighbor.RemoteDevice, neighbor.RemoteIP)
+			
 			// 尝试匹配邻居设备
 			targetIP := neighbor.RemoteIP
 			matchMethod := "IP"
 			
 			// 如果没有IP，尝试通过设备名匹配
 			if targetIP == "" && neighbor.RemoteDevice != "" {
-				fmt.Printf("  Neighbor %s has no IP, trying hostname match: %s\n",
-					neighbor.LocalInterface, neighbor.RemoteDevice)
+				fmt.Printf("    Trying hostname match: %s\n", neighbor.RemoteDevice)
 				for _, d := range b.devices {
 					if d.Hostname == neighbor.RemoteDevice {
 						targetIP = d.IP
 						matchMethod = "hostname"
-						fmt.Printf("  Matched by hostname: %s -> %s\n", d.Hostname, d.IP)
+						fmt.Printf("    ✓ Matched by hostname: %s -> %s\n", d.Hostname, d.IP)
 						break
 					}
 				}
@@ -79,14 +100,18 @@ func (b *Builder) Build() models.TopologyGraph {
 			
 			// 如果还是没有，尝试通过MAC地址匹配（新增）
 			if targetIP == "" && neighbor.RemoteMAC != "" {
-				fmt.Printf("  Neighbor %s has no IP/hostname, trying MAC match: %s\n",
-					neighbor.LocalInterface, neighbor.RemoteMAC)
+				fmt.Printf("    Trying MAC match: %s\n", neighbor.RemoteMAC)
 				for _, d := range b.devices {
 					for _, mac := range d.MACAddresses {
-						if mac == neighbor.RemoteMAC {
+						// 标准化MAC地址进行比较（去除分隔符，转小写）
+						normalizedNeighborMAC := normalizeMAC(neighbor.RemoteMAC)
+						normalizedDeviceMAC := normalizeMAC(mac)
+						
+						if normalizedNeighborMAC == normalizedDeviceMAC {
 							targetIP = d.IP
 							matchMethod = "MAC"
-							fmt.Printf("  Matched by MAC: %s -> %s\n", mac, d.IP)
+							fmt.Printf("    ✓ Matched by MAC: %s (device) == %s (neighbor) -> %s\n", 
+								mac, neighbor.RemoteMAC, d.IP)
 							break
 						}
 					}
@@ -97,12 +122,11 @@ func (b *Builder) Build() models.TopologyGraph {
 			}
 
 			if targetIP == "" {
-				fmt.Printf("  Neighbor %s could not be matched (RemoteIP=%s, RemoteMAC=%s, RemoteDevice=%s)\n",
-					neighbor.LocalInterface, neighbor.RemoteIP, neighbor.RemoteMAC, neighbor.RemoteDevice)
+				fmt.Printf("    ✗ Could not match neighbor on %s\n", neighbor.LocalInterface)
 				continue
 			}
 			
-			fmt.Printf("  Creating edge: %s (%s) -> %s via %s, matched by %s\n",
+			fmt.Printf("  ✓ Creating edge: %s (%s) -> %s via %s, matched by %s\n",
 				device.IP, neighbor.LocalInterface, targetIP, neighbor.RemoteInterface, matchMethod)
 
 			// 创建唯一的边ID
@@ -131,6 +155,19 @@ func (b *Builder) Build() models.TopologyGraph {
 	return graph
 }
 
+// normalizeMAC 标准化MAC地址（去除分隔符，转小写）
+func normalizeMAC(mac string) string {
+	// 去除所有分隔符（-、:、.）
+	result := ""
+	for _, c := range mac {
+		if c != '-' && c != ':' && c != '.' {
+			result += string(c)
+		}
+	}
+	// 转小写
+	return strings.ToLower(result)
+}
+
 // getDeviceIcon 获取设备图标
 func getDeviceIcon(deviceType models.DeviceType) string {
 	switch deviceType {