s5560x 通过 EXTENDED BOOT MENU升级交换机ipe时出现的问题

通过 EXTENDED BOOT MENU升级交换机ipe时出现的问题，

   EXTENDED BOOT MENU

1. Download image to flash

2. Select image to boot

3. Display all files in flash

4. Delete file from flash

5. Restore to factory default configuration

6. Enter BootRom upgrade menu

7. Skip current system configuration

8. Set switch startup mode

9. Set The Operating Device

0. Reboot

Ctrl+Z: Access EXTENDED ASSISTANT MENU

Ctrl+F: Format file system

Ctrl+P: Change authentication for console login

Ctrl+R: Download image to SDRAM and run

Ctrl+C: Display Copyright

Enter your choice(0-9): 1

1. Set TFTP protocol parameters

2. Set FTP protocol parameters

3. Set XMODEM protocol parameters

0. Return to boot menu

Enter your choice(0-3): 1

Enter your choice(0-3): 1

Load File Name     :S5560X_EI-CMW710-R6820.ipe

                  :.

Load File Name     :

                   :S5560X_EI-CMW710-R6820.ipe

Server IP Address  :192.168.110.4 

Local IP Address   :192.168.110.30 

Subnet Mask        :255.255.255.0 

Gateway IP Address :0.0.0.0 192.168.110.4

Are you sure to download file to flash? Yes or No (Y/N):Y

Loading...Failed!

用的是3c daemon 中的tftp服务器，配置前启用起来了，现在是下载不下来，

发现交换机进入了   EXTENDED BOOT MENU 后，连接电脑与交换机的网线灯是不亮的，网络显示断网，

这个如何处理？