Cisco 2911 Configuration Guide

C-2
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Appendix C Using ROM Monitor
Information About the ROM Monitor
Why is the Router in ROM Monitor Mode?
The router boots to ROM monitor mode when one of the following occurs:
• During power up or reload, the router did not find a valid system image.
• The last digit of the boot field in the configuration register is 0 (for example, 0x100 or 0x0).
• The Break key sequence was entered during the first 60 seconds after reloading the router.
To exit ROM monitor mode, see the “Exiting ROM Monitor Mode” section on page C-25.
When do I use ROM Monitor?
Use ROM monitor in the following situations:
• Manually loading a system image—You can load a system image without configuring the router to
load that image in future system reloads or power-cycles. This can be useful for testing a new system
image or for troubleshooting. See the “Loading a System Image (boot)” section on page C-8.
• Upgrading the system image when there are no TFTP servers or network connections, and a direct
PC connection to the router console is the only viable option—See information about upgrading the
system image in the configuration documentation for your router.
• During troubleshooting if the router crashes and hangs—See the “Troubleshooting Crashes and
Hangs (stack, context, frame, sysret, meminfo)” section on page C-20.
• Disaster recovery—Use one of the following methods for recovering the system image or
configuration file:
– TFTP download (tftpdnld)—Use this method if you can connect a TFTP server directly to the
fixed LAN port on your router. See the “Recovering the System Image (tftpdnld)” section on
page C-16.
Note Recovering the system image is different from upgrading the system image. You need to
recover the system image if it becomes corrupt or if it is deleted because of a disaster that
affects the memory device severely enough to require deleting all data on the memory device
in order to load a system image.
Tips for Using ROM Monitor Commands
• ROM monitor commands are case sensitive.
• You can halt any ROM monitor command by entering the Break key sequence (Ctrl-Break) on the
PC or terminal. The Break key sequence varies, depending on the software on your PC or terminal.
If Ctrl-Break does not work, see the Standard Break Key Sequence Combinations During Password
Recovery tech note.
• To find out which commands are available on your router and to display command syntax options,
see the “Displaying Commands and Command Syntax in ROM Monitor Mode (?, help, -?)” section
on page C-7.

Cisco 2911 Specifications

General

Ethernet LAN	Yes
Cabling technology	10/100/1000Base-T(X)
Networking standards	IEEE 802.1Q, IEEE 802.1ag, IEEE 802.3, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3ah, IEEE 802.3u
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet interface type	Gigabit Ethernet
DHCP client	-
Routing protocols	BGP, EIGRP, OSPF
Supported protocols	IPv4, IPv6, IS-IS, IGMPv3, PIM SM, SSM, DVMRP, IPSec, GRE, BVD, MPLS, L2TPv3, PPP, MLPPP, MLFR, HDLC, RS-232, RS-449, X.21, V.35, EIA-530, PPPoE, ATM
USB version	2.0
RS-232 ports	1
Expansion slots	4 x EHWIC 2 x DSP 1 x ISM
USB ports quantity	2
Ethernet LAN (RJ-45) ports	3
Firewall security	Cisco IOS
Input current	2.2 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	50 W
Product color	Black
Rack capacity	2U
Operating altitude	0 - 4000 m
Non-operating altitude	0 - 4570 m
Storage temperature (T-T)	-40 - 80 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	5 - 85 %
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Electromagnetic compatibility	47 CFR, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI V-3, EN 300-386, EN 61000, EN 55024, CISPR 24EN50082-1

Weight and Dimensions

Depth	304.8 mm
Width	438.2 mm
Height	88.9 mm
Weight	8200 g