Cisco Systems manual 3-11, Recovering a System Image Using Xmodem and Ymodem

Chapter 3 Initial Switch Router Configurations

Recovering a System Image Using Xmodem and Ymodem

Recovering a System Image Using Xmodem and Ymodem

If you do not have access to a network server and need to download a system image, you can copy an image from a local or remote computer (such as a PC, UNIX workstation, or Macintosh computer) using the Xmodem or Ymodem protocols. This functionality primarily serves as a disaster recovery technique. See Figure 3-1.

Xmodem and Ymodem are common protocols used for transferring files and are included in applications such as Windows 3.1 (TERMINAL.EXE), Windows 95 (HyperTerminal), Windows NT 3.5x (TERMINAL.EXE), Windows NT 4.0 (HyperTerminal), and Linux UNIX freeware (minicom).

Xmodem and Ymodem downloads are slow, so you should use them only when you do not have access to a network server. You can speed up the transfer by setting the transfer port speed to 57600 bps.

If all local system images are damaged or erased on your switch router, you can perform the file transfer by using the ROM monitor. On the Catalyst 2948G-L3 and the Catalyst 4908G-L3, you can only perform the file transfer from the ROM monitor over the console port.

Note Perform file transfer from the ROM monitor with either Cisco IOS Release 12.0(7)W5(15a) or later. To verify the ROM monitor version, use either the show version command from Cisco IOS software or issue the reset command from ROM MON mode.

Figure 3-1shows file transfer using the Xmodem or Ymodem protocols. The connection is from either a local or a remote computer to your switch router. You can make the connection using either the COM port on the local computer or using a modem with the remote computer.

Figure 3-1 Transferring a System Image to a Layer 3 Switch Router Using Xmodem and Ymodem Protocols

Catalyst 2948G-L3 or Catalyst 4908G-L3 switch router downloading a Cisco IOS software image from a local or remote PC

Telephone

Modemnetwork

Console

port

Local PC running terminal emulation software and Xmodem and Ymodem protocols

Modem

Remote PC running terminal emulation software and Xmodem and Ymodem protocols

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	Catalyst 2948G-L3 and Catalyst 4908G-L3 Software Feature and Configuration Guide
78-10408-01, Cisco IOS Release 12.0(7)W5(15d)		3-11