Cisco 3925 User Manual

C-1
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
APPENDIX
C
Using ROM Monitor
The ROM monitor is accessed during power up or reload when the router does not find a valid system
image, the last digit of the boot field in the configuration register is 0, or you enter the Break key
sequence during the first 5 seconds after reloading the router.
The following sections describe how to use the ROM monitor in the Cisco 3900 series, 2900 series, 1900
series integrated services routers (ISRs) to manually load a system image or upgrade the system image
for disaster, or when there are no TFTP servers or network connections.
• Prerequisites for Using the ROM Monitor, page C-1
• Information About the ROM Monitor, page C-1
• How to Use the ROM Monitor—Typical Tasks, page C-3
• Additional References, page C-27
Prerequisites for Using the ROM Monitor
Connect a terminal or PC to the router console port. For help, see the hardware installation guide for
your router.
Information About the ROM Monitor
Before using the ROM monitor, you should understand the following concepts:
• ROM Monitor Mode Command Prompt, page C-1
• Why is the Router in ROM Monitor Mode?, page C-2
• When do I use ROM Monitor?, page C-2
• Tips for Using ROM Monitor Commands, page C-2
• Accessibility, page C-3
ROM Monitor Mode Command Prompt
The ROM monitor uses the rommon x > command prompt. The x variable begins at 1 and increments
each time you press Return or Enter in ROM monitor mode.

Cisco 3925 Specifications

General

Product Type	Router
Form Factor	Rack-mountable
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Connectivity Technology	Wired
Power	AC 120/230 V (50/60 Hz)
Redundant Power Supply	Optional
Routing Protocol	OSPF, IS-IS, BGP, EIGRP, PIM
Network/Transport Protocol	IPSec
Remote Management Protocol	SNMP, Telnet, SSH, HTTP
Encryption Algorithm	DES, Triple DES, AES
Flash Memory	256 MB
Weight	11.5 kg
Interfaces	2 x SFP (mini-GBIC)
Power Source	Internal power supply
Authentication Method	RADIUS, TACACS+, LDAP
Compliant Standards	IEEE 802.1Q, IEEE 802.3af
Operating Temperature	0 to 40 °C
Operating Humidity	5% to 85% (non-condensing)
Dimensions (WxDxH)	44.5 x 47.2 x 8.9 cm