Cisco 2901 User Manual

C-3
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Appendix C Using ROM Monitor
How to Use the ROM Monitor—Typical Tasks
Accessibility
This product can be configured using the Cisco command-line interface (CLI). The CLI conforms to
accessibility code 508 because it is text based and it relies on a keyboard for navigation. All functions
of the router can be configured and monitored through the CLI.
For a complete list of guidelines and Cisco products adherence to accessibility, see the Cisco
Accessibility Products document at:
http://www.cisco.com/web/about/responsibility/accessibility/products
How to Use the ROM Monitor—Typical Tasks
This section provides the following procedures:
• Entering ROM Monitor Mode, page C-3
• Displaying Commands and Command Syntax in ROM Monitor Mode (?, help, -?), page C-7
• Displaying Files in a File System (dir), page C-8
• Loading a System Image (boot), page C-8
• Modifying the Configuration Register (confreg), page C-13
• Obtaining Information on USB Flash Devices, page C-14
• Modifying the I/O Memory (iomemset), page C-15
• Recovering the System Image (tftpdnld), page C-16
• Troubleshooting Crashes and Hangs (stack, context, frame, sysret, meminfo), page C-20
• Exiting ROM Monitor Mode, page C-25
Note This section does not describe how to perform all possible ROM monitor tasks. Use the command help
to perform any tasks that are not described in this document. See the “Displaying Commands and
Command Syntax in ROM Monitor Mode (?, help, -?)” section on page C-7.
Entering ROM Monitor Mode
This section provides two ways to enter ROM monitor mode:
• Using the Break Key Sequence to Interrupt the System Reload and Enter ROM Monitor Mode,
page C-4
• Setting the Configuration Register to Boot to ROM Monitor Mode, page C-5
Prerequisites
Connect a terminal or PC to the router console port. For help, see the hardware installation guide for
your router.

Cisco 2901 Specifications

General

Operating altitude	0 - 3000 m
Non-operating altitude	0 - 4570 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 85 %
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
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
Ethernet LAN (RJ-45) ports	2
Firewall security	Cisco IOS
Input current	1.5 A
AC input voltage	100 - 240 V
Power source type	AC
AC input frequency	47 - 63 Hz
Power consumption (typical)	40 W
Product color	Black
Rack capacity	1U
Safety	UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1
Flash memory	256 MB
Internal memory	512 MB
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	439.4 mm
Width	438.2 mm
Height	44.5 mm
Weight	6100 g