diff --git a/internal/device/h3c.go b/internal/device/h3c.go
index c2695ac..db8399b 100644
--- a/internal/device/h3c.go
+++ b/internal/device/h3c.go
@@ -47,11 +47,14 @@ func (p *H3CParser) Parse(device *models.Device, outputs []string) error {
 		for _, iface := range device.Interfaces {
 			if iface.MAC != "" {
 				macSet[iface.MAC] = true
+			} else {
+				fmt.Printf("  Interface %s has no MAC address\n", iface.Name)
 			}
 		}
 		for mac := range macSet {
 			device.MACAddresses = append(device.MACAddresses, mac)
 		}
+		fmt.Printf("  Collected %d unique MAC addresses for device %s\n", len(macSet), device.IP)
 	}
 	
 	// 解析ARP表用于MAC到IP映射（允许失败）
@@ -289,6 +292,7 @@ func (p *H3CParser) parseNeighbors(output string, arpTable map[string]string) []
 						mac := strings.TrimSpace(strings.ToLower(macParts[0]))
 						// 保存MAC地址
 						currentNeighbor.RemoteMAC = mac
+						fmt.Printf("  Parsed neighbor MAC: %s (from line: %s)\n", mac, line)
 						
 						// 通过ARP表查找IP（如果有）
 						if ip, ok := arpTable[mac]; ok {
@@ -298,7 +302,11 @@ func (p *H3CParser) parseNeighbors(output string, arpTable map[string]string) []
 							// 如果ARP表中没有，使用MAC地址作为标识（但RemoteIP仍为空）
 							currentNeighbor.RemoteDevice = mac
 						}
+					} else {
+						fmt.Printf("  WARNING: Could not parse MAC from ChassisID line: %s\n", line)
 					}
+				} else {
+					fmt.Printf("  WARNING: ChassisID line has no colon: %s\n", line)
 				}
 			}