Cisco 3700 series User Manual

B-8
Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-08
Appendix B Using the ROM Monitor
Recovering Cisco IOS Software Images
Recovering Cisco IOS Software Images
If both the boot and system images have been erased and only the ROM monitor is available, you can
use the ROM monitor xmodem command to copy a Cisco IOS software image to CompactFlash memory
from the console. The console can be connected directly to the router through the console port, or
remotely through a modem connected to the auxiliary port.
Note Copying a Cisco IOS software image from the console is very slow. This procedure should be
used only in an emergency and is not recommended for normal Cisco IOS software image
upgrades.
For the fastest possible download from a console, set the console speed to 115200 bps by using
the ROM monitor confreg command. See the “Configuration Register” procedure on page B-6.
Note Using a CompactFlash memory card to update the Cisco IOS software image is much faster than
using the console port and, when available, is the recommended method of recovering a software
image.
Description and Options of the xmodem Command
The xmodem command establishes a connection between a console and the router console port for
disaster recovery, if both the boot and system images are erased from CompactFlash memory.
xmodem [filename]—Establishes an Xmodem connection between the console and the router. The
optional argument filename specifies the source file containing the Cisco IOS software image.
Other options include the following:
• c—Uses cyclic redundancy check (CRC-16).
• y—Uses Ymodem transfer protocol.
• r—Copies the image to dynamic random-access memory (DRAM) for launch.
• x—Does not launch image on completion of download.
Console Requirements
The console must have the following files to use this procedure:
• Terminal emulation application program supporting one of the following file transfer protocols:
– Xmodem
– Xmodem–CRC
– Xmodem–1K
– Ymodem
• Cisco IOS software image file

Cisco 3700 series Specifications

General

Connectivity Technology	Wired
Operating System	Cisco IOS
Operating Temperature	32 to 104°F (0 to 40°C)
Storage Temperature	-4 to 149°F (-20 to 65°C)
Routing Protocols	BGP, OSPF, EIGRP, RIP, IS-IS
Network Management	SNMP, CiscoWorks
Security Features	ACLs, VPN, Firewall, RADIUS, TACACS+
Product Type	Network Router
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet, Serial, Frame Relay, ATM
Network/Transport Protocol	TCP/IP, UDP
Remote Management Protocol	SNMP, Telnet, SSH
Features	Quality of Service (QoS)
WAN Interfaces	Serial, ISDN, Frame Relay, ATM
LAN Interfaces	Ethernet, Fast Ethernet, Gigabit Ethernet
Processor	Motorola PowerPC
Interfaces	Variety of modular interface cards including Ethernet, Fast Ethernet, Gigabit Ethernet, Serial, ISDN, ATM, and Voice/WAN Interface Cards (VICs/VWICs)