Cisco 1941W, 1941, 2901, 2911, 2951 Configuration Manual

...

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

April 10, 2015

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Cisco 3900 Series,Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Software Configuration Guide

Objectives

Preface

This preface describes the objectives, audience, organization, conventions of this guide, and the references that accompany this document set. The following sections are provided:

• Objectives, page iii

• Audience, page iii

• Organization, page iii

• Conventions, page v

• Related Documentation, page vi

• Searching Cisco Documents, page vii

This guide provides an overview and explains how to configure the various features for the Cisco 1900 series, Cisco 2900 series, and Cisco 3900 series integrated services routers generation 2 (ISR G2). Some information may not apply to your particular router model.

Audience

This document is written for experienced technical workers who install, monitor, and troubleshoot routers under a service contract, or who work for an information technology (IT) department.

Organization

This guide is divided into three parts:

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

• Part 1—Configuring the Router

• Part 2—Configuring the Access Point

• Part 3—Appendix

2iii

Organization

Part 1 Configuring the Router Description

Module 1

Overview of Hardware and Software Describes new hardware and software features

in this release, features by platform, new slots, common ports, and getting started tasks.

Module 2

Basic Router Configuration Describes how to perform the basic router

configuration, interface configuration, and routing configuration.

Module 3

Module 4

Configuring Backup Data Lines and Remote Management

Configuring Power Efficiency Management

Describes how to configure backup interfaces, dial backup, and remote management.

Describes the hardware and software power efficiency management features on the router. See Cisco EnergyWise Configuration Guide for information about configuring power efficiency management on modules and interface.

Module 5

Module 6

Module 7

Configuring Security Features Describes how to configure security features.

Unified Communications on Cisco Integrated Services Routers

Configuring Next-Generation High-Density PVDM3 Modules

Describes voice application services that are supported on these routers.

Describes how to configure the new next-generation PVDM3 router.

Module 8

Multi-Gigabit Fabric Communication

Describes how modules and interface cards inter-communicate using the MGF router.

Module 9

Upgrading the Cisco IOS Software Describes how to upgrade the Cisco IOS

software image on the router or the access point.

Part 2 Configuring the Access Point Description

Module 1

Wireless Overview Describes the autonomous image and recovery

image shipped on the Cisco 1941W access point flash. Explains the default autonomous mode and Cisco Unified mode.

Module 2

Configuring the Wireless Device Describes how to configure the autonomous

wireless device, how to upgrade the autonomous software to Cisco Unified software, and how to configure a Unified wireless device.

Module 3

Configuring the Radio Settings Describes how to configure the radio settings

for the wireless device.

Module 4

Administering the Wireless Device Describes many administration tasks for the

wireless device.

Part 3 Appendix Description

Appendix A

Cisco IOS CLI for Initial Configuration

Describes how to perform the initial configuration of the router using the Cisco IOS CLI, and additional configuration procedures for the router.

installed on your

on the

Preface

2iv

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Preface

Conventions

This document uses the following conventions:

Appendix B

Using CompactFlash Memory Cards Describes how to use Advanced Capability CF3

memory cards on the router.

Appendix C

Using ROM Monitor Describes how to use the ROM monitor to

manually load a system image, upgrade the system image when there are no TFTP servers or network connections, or prepare for disaster recovery.

Appendix D

Changing the Configuration Register Settings

Describes the 16-bit configuration register in NVRAM and how to make changes to the register settings using the Cisco IOS CLI.

1. PVDM3 = packet voice/data module

2. MGF = Multi-Gigabit Fabric.

3. CF = CompactFlash.

Convention Indication

bold font Commands and keywords and user-entered text appear in bold font.

italic font Document titles, new or emphasized terms, and arguments for which you supply

values are in italic font.

[ ] Elements in square brackets are optional.

{x | y | z } Required alternative keywords are grouped in braces and separated by

vertical bars.

[ x | y | z ] Optional alternative keywords are grouped in brackets and separated by

vertical bars.

string A nonquoted set of characters. Do not use quotation marks around the string or

the string will include the quotation marks.

courier font Terminal sessions and information the system displays appear in courier font.

< > Non-printing characters such as passwords are in angle brackets.

[ ] Default responses to system prompts are in square brackets.

!, # An exclamation point (!) or a pound sign (#) at the beginning of a line of code

indicates a comment line.

Note Means reader take note.

Tip Means the following information will help you solve a problem.

Caution Means reader be careful. In this situation, you might perform an action that could result in equipment

damage or loss of data.

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Overview of the Hardware and Software

The Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series integrated services routers (ISRs) offer secure, wire-speed delivery of concurrent data, voice, and video services. The modular design of these routers provides maximum flexibility, allowing you to configure your router to meet evolving needs.

The routers offer features such as hardware-based virtual private network (VPN) encryption acceleration, intrusion-protection and firewall functions, and optional integrated call processing and voice mail. A wide variety of legacy network modules and interfaces, service modules (SMs), internal services modules (ISMs), next-generation packet voice/data modules (PVDM3), Services Performance Engines (SPEs), high-density interfaces for a wide range of connectivity requirements, and sufficient performance and slot density for future network expansion requirements and advanced applications are available.

Power-saving hardware and software features are incorporated throughout the series. These routers provide access to the multi-gigabit fabric, which provides a connection between switch ports without using up external ports. The logical Gigabit Ethernet (GE) interface on the router connects external and internal modules through the backplane for LAN and WAN switching. Software feature upgrades are provided through software licensing.

The following sections describe the Cisco 3900 series, 2900 series, and 1900 series ISRs:

• Feature Information, page 2

• New Features by Platform, page 4

• New Slots, page 4

• New Slots and Ports by Platform, page 5

• Common Ports, page 6

• Licensing, page 6

• Getting Started, page 7

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Feature Information

Table 1 Feature Information

Feature Description

Services Performance Engine

Cryptographic Engine Accelerator

USB Console Cisco 3900 series, 2900 series, and 1900 series ISRs provide an additional

Power Management Some modules and interface cards that are inserted in new slots provide

Chapter Overview of the Hardware and Software

SPEs

are modular motherboards on Cisco 3900 series ISRs. The SPE houses PVDM3 slots, system memory slots, and the ISM slot. The SPE provides a modular approach to system upgrades. You simply slide out the SPE from the router to replace internal modules, or upgrade the SPE to improve router performance. See Cisco 2900 series and 3900 series

Integrated Services Routers Hardware Installation Guide for instructions.

Cisco 3900 series routers with either Services Performance Engine 200 or Services Performance Engine 250 have an onboard cryptographic accelerator that is shared between SSLVPN and IPSec. By default, acceleration of SSL is disabled so IPSec performance is maximized.

See the “Configuring Security Features” section on page 127 in this guide for information about enabling the SSLVPN feature.

mechanism for configuring the system through a USB

serial console port.

The traditional RJ-45 serial console port is also available.

hardware and software power management features described below:

• High efficiency AC power supplies

• Electrical components with built-in power saving features, such as

RAM select and clock gating

• Ability to disable unused clocks to modules and peripherals

• Ability to power down unused modules and put peripherals into a

reset state, put front panel ports and unused internal components in a shutdown or reset state

Advanced Capability CompactFlash

Cisco 3900 series, 2900 series, and 1900 series ISRs use Advanced Capability CF

memory to store the system image, configuration files, and

some software data files.

SFP/Gigabit Ethernet Port Cisco 2921, Cisco 2951 and Cisco 3900 Series routers have an

SFP/Gigabit Ethernet port that supports copper and fiber concurrent connections. Media can be configured for failover redundancy when the network goes down. For more information, see the “Configuring Backup

Data Lines and Remote Management” section on page 97.

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Overview of the Hardware and Software

Table 1 Feature Information (continued)

Feature Description

New Modules and Interface Cards

Multi-Gigabit Fabric Communication

Integrated Application Services Features

Feature Information

Cisco 3900 series, 2900 series, and 1900 series ISRs introduce the following new modules and interface cards, which are inserted in the following new router slots:

• EHWIC

• PVDM3

• ISM

• SM

Note See the router’s product page at Cisco.com for a complete list of

supported modules and interfaces.

Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series ISRs use a

MGF

for the new modules and interface cards to inter-communicate on

the router. Legacy modules that support Cisco HIMI

also support MGF to inter-communicate on the router. Next generation module drivers integrate with the MGF to perform port configurations, configure packet flow, and control traffic buffering. All configurations are performed from the module-side, which may or may not lead to changes on the MGF. For more information, see the “Configuring Multi-Gigabit Fabric

Communication” section on page 211.

Cisco 3900 series, 2900 series, and 1900 series ISRs offer integrated security features and voice features.

• See the “Configuring Security Features” section on page 127

• See the “Unified Communications on Cisco Integrated Services

Routers” section on page 169

1. SPE = Services Performance Engine

2. USB = universal serial bus

3. CF = CompactFlash

4. MGF = multi-gigabit fabric

5. HIMI = High-Speed Intrachassis Module Interconnect

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Overview of the Hardware and Software

New Features by Platform

Table 2 shows new feature support by platform.

Table 2 New Features in this Release by Platform

Features 1941 1941W 2901 2911 2921 2951 3925 3925E 3945 3945E

Services Performance Engine N N N N N N Y Y Y Y

Cryptographic Engine

N N N N N N Y

Y Y

Acceleration

USB Serial Console Y Y Y Y Y Y Y Y Y Y

Power Management Y Y Y Y Y Y Y Y Y Y

New Module and Interface Card

YY Y Y YYYYYY

Features

Advanced Capability

YY Y Y YYYYYY

CompactFlash

SFP/Gigabit Ethernet Port N N N N Y Y Y Y Y Y

Multi-Gigabit Fabric

YY Y Y YYYYYY

Communication

Integrated Application Services Y

1. Must have Services Performance Engine 200 installed in the router.

2. Must have Services Performance Engine 250 installed in the router.

3. Does not support Voice application services.

4. Does not support Voice application services. Includes embedded wireless access point that supports Cisco Unified Wireless Architecture.

Y Y YYYYYY

New Slots

Cisco 3900 series, 2900 series, and 1900 series ISRs have introduced new slots on the chassis. The first column in Tabl e 3 lists the new slot names. The second column lists the corresponding old slot names. Modules previously inserted in the old slots now insert in the new slots with the help of an adapter card.

For instance, network modules (NMs), enhanced network modules (NMEs), and extension voice modules (EVMs) use an adapter, or carrier card, to insert into the SM slot. See your router’s hardware installation guide for adapter information.

Table 3 New Slot Names and Old Slot Names

New Slot Names Old Slot Names

EHWIC HWIC,HWIC-DW, WIC, VWIC, VIC

ISM AIM

PVDM3 PVDM

SM NM, NME, EVM

SPE

1. AIM is not supported in this release. See your hardware installation guide for more information.

2. The SPE is available only on the Cisco 3900 series ISRs.

—

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Overview of the Hardware and Software

New Slots and Ports by Platform

This section provides the type and number of the slots and ports available in the Cisco 3900 series, 2900 series, and 1900 series ISRs.

• Cisco 3900 Series ISRs, page 5

• Cisco 2900 Series ISRs, page 5

• Cisco 1900 Series ISRs, page 6

Cisco 3900 Series ISRs

Table 4 lists the slots and ports available on Cisco 3900 series routers.

To view the installation guide, see the following URL

http://www.cisco.com/en/US/docs/routers/access/2900/hardware/installation/guide/Hardware_Installati on_Guide.html

Table 4 Cisco 3900 Series Routers

New Slots and Ports by Platform

Router EHWIC SM

Cisco 39454 41 14 23

Cisco 3945E 3 4 1 0 3 2 4

Cisco 39254 21 14 23

Cisco 3925E 3 2 1 0 3 2 4

1. One RJ-45 GE + two combo GE/SFPs.

2. Four RJ-45 GE, or three RJ-45 GE + one combo GE/SFP, or two RJ-45 GE + two combo GE/SFP.

3. One RJ-45 GE + two combo GE/SFPs, or three RJ-45 GEs.

4. Four RJ-45 GE, or three RJ-45 GE + one combo GE/SFP, or two RJ-45 GE + two combo GE/SFP.

Cisco 2900 Series ISRs

Table 5 lists the slots and ports available on Cisco 2900 series routers.

To view the installation guide, see the following URL

http://www.cisco.com/en/US/docs/routers/access/2900/hardware/installation/guide/Hardware_Installati on_Guide.html

Table 5 Cisco 2900 Series Routers

Router EHWIC SM

Cisco 29514 22 13 22 1

Cisco 29214 11 13 22 1

Cisco 29114 11 12 23 0

Cisco 29014 00 12 23 0

Dbl-Wide SM ISM PVDM3 CF

GE (RJ-45)/ SFP ports SPE

GE (RJ-45) ports

GE (RJ-45)/ SFP ports

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Common Ports

Cisco 1900 Series ISRs

Table 6 lists the slots and ports available on Cisco 1900 series routers.

To view the installation guide, see the following URL

http://www.cisco.com/en/US/docs/routers/access/1900/hardware/installation/guide/1900_HIG.html

Table 6 Cisco 1900 Series ISR Routers

Chapter Overview of the Hardware and Software

Router EHWIC

Cisco 1941 2 1 0 0 1 0 0 2 2

Cisco 1941W 2 1 0 0 0 0 1 2 2

1. One of the two EWHIC slots is adouble-wide EWHIC slot,giving the appearance of three EWHIC slots.

Common Ports

The following ports are common among Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series routers:

• Gigabit Ethernet RJ45—Ports available through an RJ45 connector.

• Gigabit Ethernet RJ45/SFP—Ports available through RJ45- SFP connectors. Connection supports

fail-over if the secondary connection goes down.

• RS232 Aux—Supports modem control lines and remote administration for box-to-box redundancy

applications.

• RS232 Serial Console—Supports modem control lines and remote administration of the router with

the proprietary cable shipped in the box.

• Type A USB 2.0—Supports USB-based flash memory sticks, security tokens, and USB-compliant

devices.

• Type B mini-port USB Serial Console—Supports modem control lines and remote administration of

the router using a type B USB-compliant cable.

Dbl-Wide

EHWIC SM

Dbl-Wide SM ISM PVDM3 WLAN CF

GE (RJ-45) ports

Licensing

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series ISRs support Cisco IOS software entitlement. Your router is shipped with the software image and the corresponding permanent licenses for the technology packages and features that you specified preinstalled. You do not need to activate or register the software prior to use. If you need to upgrade or install a new technology package or feature see Software Activation on Integrated Services Router,

http://www.cisco.com/en/US/docs/routers/access/sw_activation/SA_on_ISR.html.

Chapter Overview of the Hardware and Software

Getting Started

See the router-specific hardware installation guide to install the router in an appropriate location. Connect the router with the appropriate cables. Supply power to the router and perform the initial software configuration using Cisco Configuration Professional Express. After the initial configuration is completed, perform the following steps:

Step 1 Follow instructions in the “Basic Router Configuration” section on page 13 to perform additional router

configurations.

Step 2 (Optional) If you are setting up the Cisco 1941W ISR, follow instructions in the “Configuring the

Wireless Device” section on page 247 to configure the embedded wireless device on the router.

Step 3 Follow instructions in the “Configuring Security Features” section on page 127 to configure security

features on the router.

Step 4 Follow instructions in the “Unified Communications on Cisco Integrated Services Routers” section on

page 169 to configure Voice features on the router.

Getting Started

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

IOS Commands

Table 7 lists the Cisco IOS commands and features that can trigger an erase, write, or erase and write

operation on a device's boot flash. The erase or write of an attribute on the boot flash can hold the CPU for a few milliseconds to complete the operation. The CPU hold can result in a functional impact on protocols or applications that are extremely time sensitive, for instance, Bidirectional Forwarding Detection (BFD) or routing protocols which use finely tuned short timers. For example, OSPF with fast hellos and short dead timers.

Table 7 Cisco IOS Commands

Functionality Command Name Description

Write to NV memory.

Changing the configuration register value.

write memory This command

writes the device's configuration in to the Non-Volatile RAM (NVRAM) on the boot flash. Use this command in privileged EXEC mode.

config-register

value

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. Use this command in Global configuration mode.

Chapter Overview of the Hardware and Software

Configuration Example Impact

Router#write memory

A BFD flap is triggered when one of the following configuration elements are activated or deactivated and configuration is saved to memory:

(config)#warm-reboot (config)#boot config (config)#boot system

Router(config)#

Potential enough to flap bfd.

config-register 0xvalue

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Overview of the Hardware and Software

Table 7 Cisco IOS Commands

Functionality Command Name Description

Copy running configuration to startup configuration.

copy running-config startup-config

This command copies running configuration to startup configuration.

Changing boot variables.

boot {bootstrap | config |host| netowrk | system}

This command configures bootstrap image file, configuration file, router specific config file, Networkwide config file or system image file.

Setting the system software clock manually.

clock set hh:mm:ss day month year

To manually set the system software clock, use one of the formats of the

clock set

command in privileged EXEC mode.

Configuration Example Impact

Router#copy running-config startup-config

A BFD flap is not triggered for all 'write mem' commands. For instance, when the configuration attributes changes without either a write or an erase+write on the NVRAM, the BFD is not triggered.

In the following example, when one of the configuration elements are activated/deactivated and the configuration is saved using the 'write mem' command, the flap is triggered:

(config)#warm-reboot (config)#boot config (config)#boot system

Router(config)#bo

Potential enough to flap bfd.

ot bootstrap

Router#clock set

Potential enough to flap bfd.

13:32:00 23 July 1997

Note Every time the command is issued.

IOS Commands

clock set hh:mm:ss day month year

clock set hh:mm:ss month day year

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

IOS Commands

Table 7 Cisco IOS Commands

Functionality Command Name Description

Random Entropy

No special Command exists for this.

After the system boot up, entropy is collected by accessing the security chip. This is potential enough to flap the BFD session immediately after the router boots up.

Crashing the router on user’s wish.

test crash This is a hidden

Cisco IOS command to crash the Cisco router on a user’s wish.

License EULA license accept

end user agreement

To accept the End-user License Agreement (EULA) for all Cisco IOS software packages and features at one time.

RTC Battery Failure

No CLI Write the event of

losing battery for Real Time Clock.

Chapter Overview of the Hardware and Software

Configuration Example Impact

No command Potential enough to flap bfd.

Router#test crash Potential enough to flap bfd.

Router(config)#lice

Potential enough to flap bfd.

nse accept end user agreement

No CLI Potential enough to flap bfd.

Note This is a one-time event during a

hardware failure.

Erasing NV memory.

Erasing startup-config

Erasing NV memory.

Writing configuration to memory.

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

erase nvram This command

erases the nvram: file system.

erase startup-config

This command erases startup configurations.

write erase This command

erases the NV memory.

write This command

quickly saves config to memory.

Router#erase

Potential enough to flap bfd.

nvram:

Router#erase

Potential enough to flap bfd.

startup-config

Router#write erase Potential enough to flap bfd.

Router#write Potential enough to flap bfd.

Chapter Overview of the Hardware and Software

Table 7 Cisco IOS Commands

Functionality Command Name Description

Reloading the router.

reload This command

reloads the router. The reload time is written to NV memory.

Enabling warm rebooting.

warm-reboot count value

Enables a router to warm-reboot.

uptime value

New software license boot.

license boot module module-name level license-level

To boot a new software license on routing platforms, use the license boot module command in global configuration mode.

Configuration Example Impact

Router#reload Potential enough to flap bfd.

Router(config)#

Potential enough to flap bfd.

warm-reboot count 10 uptime 10

Router(config)#

Potential enough to flap bfd.

license boot module c2900 technology-packa ge datak9

IOS Commands

Enabling or disabling USB ports.

Disabling access to ROMMON.

config mode : hw-module usb

[no] service password-recove ry

Enable or disable USB ports from IOS config mode.

This command disables all access to ROMMON.

Router(config)#hw

-module usb disable

Router(config)#no hw-module usb disable

Router# no service password-recover y

Will trigger a BFD flap.

Potential enough to flap bfd.

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

IOS Commands

Chapter Overview of the Hardware and Software

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Basic Router Configuration

This module provides configuration procedures for Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series integrated services routers (ISRs). It also includes configuration examples and verification steps whenever possible.

Note See Appendix A, “Cisco IOS CLI for Initial Configuration” for information on how to perform the initial

configuration using the Cisco Internet Operating System (IOS) command line interface on Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series integrated services routers.

Basic Configuration

• Default Configuration, page 14

• Configuring Global Parameters, page 15

Interface Configuration

• Interface Ports, page 17

• Configuring Gigabit Ethernet Interfaces, page 18

• Configuring Wireless LAN Interfaces, page 19

• Configuring Interface Card and Module Interfaces, page 19

• Configuring a Loopback Interface, page 19

Routing Configuration

• Configuring Command-Line Access, page 21

• Configuring Static Routes, page 23

• Configuring Dynamic Routes, page 25

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Default Configuration

When you boot up your Cisco router for the first time, you notice some basic configuration has already been performed. Use the show running-config command to view the initial configuration, as shown in the following example.

Router# show running-config Building configuration... Current configuration : 723 bytes ! version 12.4 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! logging message-counter syslog ! no aaa new-model ! no ipv6 cef ip source-route ip cef ! ! ! ! multilink bundle-name authenticated ! ! archive log config hidekeys ! ! ! ! ! interface GigabitEthernet0/0 no ip address shutdown duplex auto speed auto ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface GigabitEthernet0/2 no ip address shutdown duplex auto speed auto ! ip forward-protocol nd

Chapter Basic Router Configuration

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Basic Router Configuration

! no ip http server ! ! ! ! ! control-plane ! ! line con 0 line aux 0 line vty 0 3 login ! exception data-corruption buffer truncate scheduler allocate 20000 1000 end

Configuring Global Parameters

SUMMARY STEPS

DETAILED STEPS

Step 1

Step 2

To configure the global parameters for your router, follow these steps.

1. configure terminal

2. hostname name

3. enable secret password

4. no ip domain-lookup

Command Purpose

configure terminal

Enters global configuration mode, when using the console port.

Example:

Router> enable Router# configure terminal Router(config)#

hostname name

Use the following to connect to the router with a remote terminal:

telnet router name or address Login: login id Password: ********* Router> enable

Specifies the name for the router.

Example:

Router(config)# hostname Router Router(config)#

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Configuring I/O Memory Allocation

Command Purpose

Step 3

enable secret password

Example:

Router(config)# enable secret cr1ny5ho Router(config)#

Step 4

no ip domain-lookup

Example:

Router(config)# no ip domain-lookup Router(config)#

For complete information on global parameter commands, see the Cisco IOS Release configuration guide documentation set.

Configuring I/O Memory Allocation

Chapter Basic Router Configuration

Specifies an encrypted password to prevent unauthorized access to the router.

Disables the router from translating unfamiliar words (typos) into IP addresses.

Example

To reallocate the percentage of DRAM in use for I/O memory and processor memory on Cisco 3925E and Cisco 3945E routers, use the memory-size iomem i/o-memory-percentage command in global configuration mode. To revert to the default memory allocation, use the no form of this command. This procedure enables smartinit.

Syntax Description

i/o-memory-percentage The percentage of DRAM allocated to I/O memory. The values permitted

are 5, 10, 15, 20, 25, 30, 40, and 50. A minimum of 201 MB of memory is required for I/O memory.

Tip We recommend that you configure the memory-size iomem below 25%. Any value above 25% should be

used only for enhancing IPSec performance.

When you specify the percentage of I/O memory in the command line, the processor memory automatically acquires the remaining percentage of DRAM memory.

The following example allocates 25% of the DRAM memory to I/O memory and the remaining 75% to processor memory:

Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)# memory-size iomem 5 IO memory size too small: minimum IO memory size is 201M Router(config)# Router(config)# memory-size iomem ? <5-50> percentage of DRAM to use for I/O memory: 5, 10, 15, 20, 25, 30, 40, 50

Router(config)# memory-size iomem 25 Smart-init will be disabled and new I/O memory size will take effect upon reload. Router(config)# end

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Chapter Basic Router Configuration

Verifying IOMEM Setting

Router# show run Current configuration : 6590 bytes ! ! Last configuration change at 16:48:41 UTC Tue Feb 23 2010 ! version 15.1 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption service internal ! hostname Router1 ! ! no aaa new-model !

memory-size iomem 25

Interface Ports

Table 1 lists the interfaces that are supported on Cisco 3900 series, Cisco 2900 series, and Cisco 1900

series integrated services routers.

Table 1 Interfaces by Cisco Router

Slots, Ports, Logical Interface, Interfaces 1941 2901

2911 & 2921 2951 & 3925 & 3945 3925E & 3945E

Onboard GE ports Gi0/0,Gi0/1 Gi0/0,Gi0/1 Gi0/0,Gi0/1,GI0/2 Gi0/0,Gi0/1,GI0/2 Gi0/0,Gi0/1,GI0/2,

GI0/3

Onboard WLAN Wlan-ap0 not supported not supported not supported not supported

Onboard WLAN GE connection to MGF

Onboard ISM GE interface on the PCIe

Onboard ISM GE connection to MGF

USB usbflash0,

Interfaces on HWIC and VWIC

Interfaces on Double Wide-HWIC

Interfaces on SM not supported not supported interface1/port interface1-2/port

Wlan-Gi0/0 not supported not supported not supported not supported

service-module

-name-ISM 0/0

service-module

-name-ISM 0/1

usbflash1

usbtoken0, usbtoken1

interface0/0/ port interface0/1/ port

interface0/1 port

service-modulename-ISM 0/0

service-modulename-ISM 0/1

usbflash0, usbflash1

usbtoken0, usbtoken1

interface0/0/port interface0/1/port interface0/2/port interface 0/3/port

interface0/1/port

interface0/3/port

service-modulename-ISM 0/0

service-modulename-ISM 0/1

usbflash0, usbflash1

usbtoken0, usbtoken1

interface0/0/port interface0/1/port interface0/2/port interface 0/3/port

interface0/1/port

interface0/3/port

service-modulename-ISM 0/0

service-modulename-ISM 0/1

usbflash0, usbflash1

usbtoken0, usbtoken1

interface0/0/port interface0/1/port interface0/2/port interface 0/3/port

interface0/1/port

interface0/3/port

interface1-4/port

not supported

usbflash0, usbflash1

usbtoken0, usbtoken1

interface1-2/port

interface1-4/port

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Configuring Gigabit Ethernet Interfaces

Table 1 Interfaces by Cisco Router (continued)

Chapter Basic Router Configuration

Slots, Ports, Logical Interface, Interfaces 1941 2901

Interfaces on Double

not supported not supported not supported interface 2/port5

Wide-SM

Interfaces HWIC on

not supported not supported interface1wic-slot/

Interfaces VWIC on SM

1. On the Cisco 2901 router, the numbering format for configuring an asynchronous interface is 0/slot/port. To configure the line associated with an asynchronous interface, simply use the interface number to specify the asynchronous line. For example, line 0/1/0 specifies the line associated with interface serial 0/1/0 on a WIC-2A/S in slot 1. Similarly, line 0/2/1 specifies the line associated with interface async 0/2/1 on a WIC-2AM in slot 2.

2. MGF = multi-gigabit fabric

3. Applies only to Cisco 2951, Cisco 3925, and Cisco 3925E routers.

4. Applies only to Cisco 3945 and Cisco 3945E routers.

5. Applies only to Cisco 2951, Cisco 3925, and Cisco 3925E routers.

6. Applies only to Cisco 3945 and Cisco 3945E routers.

7. Applies only to Cisco 2951, Cisco 3925, and Cisco 3925E routers.

8. Applies only to Cisco 3945 and Cisco 3945E routers.

2911 & 2921 2951 & 3925 & 3945 3925E & 3945E

interface 2/port

interface 4/port

interface1-2/wic-

slot/port interface1-4/wic-

slot/port

port

interface4/port

interface1-2/wicslot/port

interface1-4/wicslot/port

Configuring Gigabit Ethernet Interfaces

To manually define onboard Gigabit Ethernet (GE) interfaces, follow these steps, beginning in global configuration mode.

SUMMARY STEPS

DETAILED STEPS

Step 1

Step 2

1. interface gigabitethernet slot/port

2. ip address ip-address mask

3. no shutdown

4. exit

Command Purpose

interface gigabitethernet slot/port

Enters the configuration mode for a Gigabit Ethernet interface on the router.

Example:

Router(config)# interface gigabitethernet 0/1 Router(config-if)#

ip address ip-address mask

Sets the IP address and subnet mask for the specified GE interface.

Example:

Router(config-if)# ip address 192.168.12.2

255.255.255.0 Router(config-if)#

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Basic Router Configuration

Command Purpose

Step 3

Step 4

no shutdown

Example:

Router(config-if)# no shutdown Router(config-if)#

exit

Example:

Router(config-if)# exit Router(config)#

Configuring Wireless LAN Interfaces

The wireless LAN interface on the Cisco 1941W router enables connection to the router through interface wlan-ap0. For more information about configuring a wireless connection, see the

“Configuring the Wireless Device” section on page 247.

Configuring Wireless LAN Interfaces

Enables the GE interface, changing its state from administratively down to administratively up.

Exits configuration mode for the GE interface and returns to global configuration mode.

Configuring Interface Card and Module Interfaces

To configure interface cards and modules inserted in internal services module (ISM), enhanced high-speed WAN interface card (EHWIC), Ethernet WAN interface card (EWIC), and service module (SM) slots, see the appropriate interface card or module configuration documents on Cisco.com.

Configuring a Loopback Interface

The loopback interface acts as a placeholder for the static IP address and provides default routing information.

For complete information on the loopback commands, see the Cisco IOS Release configuration guide documentation set.

To configure a loopback interface, follow these steps, beginning in global configuration mode.

SUMMARY STEPS

1. interface type number

2. ip address ip-address mask

3. exit

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Configuring a Loopback Interface

DETAILED STEPS

Step 1

Step 2

Step 3

Command Purpose

interface type number

Enters configuration mode for the loopback interface.

Example:

Router(config)# interface Loopback 0 Router(config-if)#

ip address ip-address mask

Sets the IP address and subnet mask for the loopback interface.

Example:

Router(config-if)# ip address 10.108.1.1

255.255.255.0 Router(config-if)#

exit

Exits configuration mode for the loopback interface and returns to global configuration

Example:

Router(config-if)# exit Router(config)#

mode.

Chapter Basic Router Configuration

Example

The loopback interface in this sample configuration is used to support Network Address Translation (NAT) on the virtual-template interface. This configuration example shows the loopback interface configured on the gigabit ethernet interface with an IP address of 200.200.100.1/24, which acts as a static IP address. The loopback interface points back to virtual-template1, which has a negotiated IP address.

! interface loopback 0 ip address 200.200.100.1 255.255.255.0 (static IP address) ip nat outside ! interface Virtual-Template1 ip unnumbered loopback0 no ip directed-broadcast ip nat outside !

Verifying Configuration

To verify that you have properly configured the loopback interface, enter the show interface loopback command. You should see verification output similar to the following example.

Router# show interface loopback 0 Loopback0 is up, line protocol is up Hardware is Loopback Internet address is 200.200.100.1/24 MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation LOOPBACK, loopback not set Last input never, output never, output hang never Last clearing of "show interface" counters never Queueing strategy: fifo Output queue 0/0, 0 drops; input queue 0/75, 0 drops

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Chapter Basic Router Configuration

5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out

Another way to verify the loopback interface is to ping it:

Router# ping 200.200.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 200.200.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

Configuring Command-Line Access

To configure parameters to control access to the router, follow these steps, beginning in global configuration mode.

Configuring Command-Line Access

Note The TTY lines are asynchronous lines used for inbound or outbound modem and terminal connections

SUMMARY STEPS

and can be seen in a router or access server configuration as line x. The specific line numbers are a function of the hardware built into or installed on the router or access server. In Cisco ISR G2 series routers, the TTY lines are incremented by 1 and start with line number3 instead of line number 2 in Cisco ISR G1 series routers. In ISR G2 series routers, line number 2 cannot be accessed since it has been used for the second core feature.TTY lines are not static and line numbers can be changed in future when more features are added similar to the second core.

1. line [aux | console | tty | vty] line-number

2. password password

3. login

4. exec-timeout minutes [seconds]

5. line [aux | console | tty | vty] line-number

6. password password

7. login

8. end

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Configuring Command-Line Access

DETAILED STEPS

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Command Purpose

line [aux | console | tty | vty] line-number

Enters line configuration mode, and specifies the type of line.

Example:

Router(config)# line console 0 Router(config-line)#

password password

This example specifies a console terminal for access.

Specifies a unique password for the console terminal line.

Example:

Router(config-line)# password 5dr4Hepw3 Router(config-line)#

Enables password checking at terminal session login.

Example:

Router(config-line)# login Router(config-line)#

exec-timeout minutes [seconds]

Sets the interval that the EXEC command interpreter waits until user input is detected. The

Example:

Router(config-line)# exec-timeout 5 30 Router(config-line)#

default is 10 minutes. Optionally, add seconds to the interval value.

This example shows a timeout of 5 minutes and 30 seconds. Entering a timeout of 0 0 specifies never to time out.

line [aux | console | tty | vty] line-number

Specifies a virtual terminal for remote console access.

Example:

Router(config-line)# line vty 0 4 Router(config-line)#

password password

Specifies a unique password for the virtual terminal line.

Example:

Router(config-line)# password aldf2ad1 Router(config-line)#

Enables password checking at the virtual terminal session login.

Example:

Router(config-line)# login Router(config-line)#

end

Exits line configuration mode, and returns to privileged EXEC mode.

Example:

Router(config-line)# end Router#

Chapter Basic Router Configuration

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

+ 378 hidden pages

Cisco 1941W, 1941, 2901, 2911, 2951 Configuration Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide

Preface

Overview of the Hardware and Software

Feature Information

New Features by Platform

New Slots

New Slots and Ports by Platform

Cisco 3900 Series ISRs

Cisco 2900 Series ISRs

Common Ports

Cisco 1900 Series ISRs

Licensing

Getting Started

IOS Commands

Basic Router Configuration

Default Configuration

Configuring Global Parameters

Configuring I/O Memory Allocation

Interface Ports

Configuring Gigabit Ethernet Interfaces

Configuring Wireless LAN Interfaces

Configuring Interface Card and Module Interfaces

Configuring a Loopback Interface

Configuring Command-Line Access