Cisco 2800 Series User Manual

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Changing the Configuration Register Settings
This document describes the 16-bit configuration register in NVRAM and includes the following
sections:
• Platforms Supported by This Document, page 1
• About the Configuration Register, page 1
• Changing the Configuration Register Settings, page 4
• Displaying the Configuration Register Settings, page 5
• Configuring the Console Line Speed (Cisco IOS CLI), page 5
Platforms Supported by This Document
Use this document with the following platforms:
• Cisco 1800 series routers
• Cisco 2800 series routers
• Cisco 3800 series routers
About the Configuration Register
The router has a 16-bit configuration register in NVRAM. Each bit has value 1 (on or set) or value 0 (off
or clear), and each bit setting affects the router behavior upon the next reload power cycle.
You can use the configuration register to
• Force the router to boot into the ROM monitor (bootstrap program)
• Select a boot source and default boot filename
• Enable or disable the Break function
• Control broadcast addresses
• Recover a lost password
• Change the console line speed

Cisco 2800 Series Specifications

General

Power Supply	Internal power supply
Product Type	Router
Form Factor	Rack-mountable
Connectivity Technology	Wired
Power Device	Internal power supply
Operating System	Cisco IOS
Integrated Services	Security, voice
WAN Interfaces	T1/E1, Serial
LAN Interfaces	Fast Ethernet, Gigabit Ethernet
Expansion Slots	4
Data Link Protocol	Ethernet, Fast Ethernet, Gigabit Ethernet
Network/Transport Protocol	IP, TCP
Remote Management Protocol	SNMP, Telnet
Features	VPN support, Quality of Service (QoS), VLAN support
Voltage Required	AC 100-240 V
Security Features	Firewall, VPN, Access Control Lists (ACLs)