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Gateway of Last Resort, SUMMARY STEPS, DETAILED STEPS

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Performing the Initial Configuration on the Router Chapter 4 Configuring the Router Gateway of Last Resort When default information is being passed along through a dynamic routing protocol, no further configuration is required. The system periodically scans its routing table to choose the optimal default network as its default route. In the case of RIP, there is only one choice, network 0.0.0.0. In the case of IGRP, there might be several networks that can be candidates for the system default. The Cisco IOS software uses both administrative distance and metric information to determine the default route (gateway of last resort). The selected default route appears in the gateway of last resort display of the show ip route EXEC command. If dynamic default information is not being passed to the software, candidates for the default route are specified with the ip default-network global configuration command. In this usage, the ip default-network command takes an unconnected network as an argument. If this network appears in the routing table from any source (dynamic or static), it is flagged as a candidate default route and is a possible choice as the default route. If the router has no interface on the default network, but does have a route to it, it considers this network as a candidate default path. The route candidates are examined and the best one is chosen, based on administrative distance and metric. The gateway to the best default path becomes the gateway of last resort. SUMMARY STEPS 1. enable 2. configure terminal 3. ip routing 4. ip route dest-prefix mask next-hop-ip-address [admin-distance] [permanent] 5. ip default-network network-number or ip route dest-prefix mask next-hop-ip-address 6. end 7. show ip route DETAILED STEPS Command or Action Step 1 enable Step 2 Example: Router> enable configure terminal Step 3 Example: Router# configure terminal ip routing Example: Router(config)# ip routing Purpose Enables privileged EXEC mode. • Enter your password if prompted. Enters global configuration mode. Enables IP routing. 4-16 Cisco 2900 and 3900 Series Hardware Installation OL-18712-01

Section	Page
Cisco 2900 and 3900 Series Hardware Installation	1
Preface	3
Objectives	3
Audience	3
Organization	4
Conventions	5
Related Documentation	11
Searching for Cisco Documents	13
Obtaining Documentation and Submitting a Service Request	13
Overview of the Routers	21
Chassis Views	22
Cisco 2901 Chassis	22
Cisco 2911 Chassis	24
Cisco 2921 and Cisco 2951 Chassis	26
Cisco 3900 Series Chassis	28
Locating the Serial Number, PID, VID and CLEI	32
Labels on Cisco 2901	33
Labels on Cisco 2911	34
Labels on Cisco 2921 and Cisco 2951	34
Labels on Cisco 3925 and Cisco 3945	35
For Additional Help Locating Labels on the Router	36
Hardware Features	36
Built-in Interface Ports	36
Gigabit Ethernet Ports	37
GE Ports	37
SFP Ports	37
USB Serial Console Port	37
Removable and Interchangeable Modules and Cards	38
Services Performance Engine	40
Service Modules	40
Enhanced High-Speed WAN Interface Cards	40
Integrated Service Modules	41
Packet Voice Data Modules	41
Memory	41
Power Supplies	43
Module and Router Power Consumption	44
Fans, Ventilation, and Airflow	44
Real-Time Clock	46
Secure Key	47
Cryptographic Accelerator	47
Slot, Port, and Interface Information	47
LED Indicators	49
Specifications	52
Periodic Inspection and Cleaning	66
Preparing for Router Installation	67
Safety Recommendations	68
Safety with Electricity	69
Preventing Electrostatic Discharge Damage	70
General Site Requirements	70
Rack Requirements	70
Router Environmental Requirements	71
Power Guidelines and Requirements	72
Network Cabling Specifications	73
Console and Auxiliary Port Considerations	73
Console Port Connections	73
EIA/TIA-232	73
USB Serial Console	73
Auxiliary Port Connections	74
Preparing for Network Connections	75
Ethernet Connections	75
Serial Connections	75
Configuring Serial Connections	75
Serial DTE or DCE Devices	76
Signaling Standards Supported	76
Distance Limitations	76
Asynchronous/Synchronous Serial Module Baud Rates	77
ISDN BRI Connections	77
CSU/DSU Connections	78
Required Tools and Equipment for Installation and Maintenance	78
Installation Checklist	80
Creating a Site Log	81
Installing and Connecting the Router	83
What you Need to Know	85
Before you Begin	85
Unpacking the Router	86
Installing the Router	86
Rack-Mounting the Chassis	87
Attaching Rack-Mount Brackets to Cisco 2901 Routers	87
Attaching Rack-Mount Brackets to Cisco 2911, Cisco 2921, and Cisco 2951 Routers	88
Attaching Rack-Mount Brackets to Cisco 3900 Series Routers	90
Mounting the Router in a Rack	92
Grounding the Chassis	94
Setting the Chassis on a Desktop	94
Mounting a Cisco 2901 or 2911 Router on a Wall	95
Attaching Brackets to the Router for Wall Mounting	95
Attaching the Router to a Wall	95
Chassis Grounding	97
Connecting Power	100
Connecting to AC Power	100
Connecting to DC Power	101
DC Wiring Requirements for Cisco 2911, 2921, and 2951 Routers	101
Wiring Procedure for DC Input on Cisco 2911, 2921, and 2951 Routers	102
Approved Scenarios and Scenarios Not Approved for Dual DC Power Supply Configuration on Cisco 2911, 2921, and 2951 Routers	105
DC Wiring Requirements for Cisco 3900 Series Routers	107
Cisco 3900 Series Router Wiring Procedure for DC Input	108
Dual DC Power Supply Configuration in Cisco 3925 and Cisco 3925-NOVPN Routers	110
Connecting to Backup Power	113
Connecting to a Console Terminal or Modem	113
Connecting to the Serial Port with Microsoft Windows	113
Connecting to the Console Port with Mac OS X	117
Connecting to the Console Port with Linux	118
Installing the Cisco Microsoft Windows USB Device Driver	118
Installing the Cisco Microsoft Windows XP USB Driver	118
Installing the Cisco Microsoft Windows 2000 USB Driver	119
Installing the Cisco Microsoft Windows Vista USB Driver	119
Uninstalling the Cisco Microsoft Windows USB Driver	120
Uninstalling the Cisco Microsoft Windows XP and 2000 USB Driver	120
Uninstalling the Cisco Microsoft Windows Vista USB Driver	120
Connecting to the Auxiliary Port	121
Connecting WAN, LAN, and Voice Interfaces	124
Ports and Cabling	126
Connection Procedures and Precautions	127
Configuring the Router	129
Powering up the Router	129
Checklist for Power Up	129
Power Up Procedure	130
Verifying the Front Panel LED Indications	132
Performing the Initial Configuration on the Router	132
Using Cisco Setup Command Facility	132
Completing the Configuration	135
Using Cisco Configuration Professional Express	136
Using Cisco IOS CLI-Manual Configuration	136
Configuring the Router Hostname	137
SUMMARY STEPS	137
DETAILED STEPS	137
Configuring the Enable and Enable Secret Passwords	138
Restrictions	138
SUMMARY STEPS	138
DETAILED STEPS	139
Configuring the Console Idle Privileged EXEC Timeout	139
SUMMARY STEPS	140
DETAILED STEPS	140
Examples	140
Configuring Gigabit Ethernet Interfaces	141
SUMMARY STEPS	141
DETAILED STEPS	141
Examples	142
Specifying a Default Route or Gateway of Last Resort	143
Configuring IP Routing and IP Protocols	143
IP Routing	143
Default Routes	143
Default Network	143
Gateway of Last Resort	144
SUMMARY STEPS	144
DETAILED STEPS	144
Examples	145
Configuring Virtual Terminal Lines for Remote Console Access	146
SUMMARY STEPS	146
DETAILED STEPS	146
Examples	147
What to Do Next	147
Configuring the Auxiliary Line	147
SUMMARY STEPS	148
DETAILED STEPS	148
Verifying Network Connectivity	149
Prerequisites	149
SUMMARY STEPS	149
DETAILED STEPS	149
Examples	149
Saving Your Router Configuration	150
SUMMARY STEPS	150
DETAILED STEPS	150
Saving Backup Copies of Configuration and System Image	150
SUMMARY STEPS	151
DETAILED STEPS	151
Examples	151
Verifying the Initial Configuration	152
Installing and Upgrading Internal Modules and FRUs	153
Safety Warnings	154
Accessing Internal Modules	156
Removing and Replacing the Chassis Cover	156
Removing and Replacing the Services Performance Engine	158
Locating Internal Modules	159
Installing and Removing DRAM DIMMs	165
Locating and Orienting DRAM DIMM	165
Removing a DRAM DIMM	166
Installing a DRAM DIMM	167
Installing and Removing ISMs	168
Software Requirement for ISMs	169
Locating an ISM	169
Removing an ISM	169
Installing an ISM	170
Verifying ISM Installation	172
Installing and Removing PVDM3	172
PVDM3 Location and Orientation	173
Removing a PVDM3	173
Installing a PVDM3	174
Installing and Removing PVDM2s	175
Replacing Power Supplies and Redundant Power Supplies	180
Replacing the Cisco 2901 Router Power Supply	182
Replacing the Cisco 2911 Router Power Supply	184
Installing and Removing the Cisco 2911 Router Optional DC Power Supply	185
Installing the 2911 DC Power Supply	185
Removing the 2911 DC Power Supply	186
Installing the Cisco 2911 Router Power Supply Blank	186
Replacing the Cisco 2911 Router Redundant Power Supply	188
Replacing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Power Supply	188
Replacing the Power Supply on the Cisco 2921 and Cisco 2951 Routers	189
Replacing the Power Supply on the Cisco 3900 Series Routers	190
Inserting POE supply in an Ethernet Switch Network Module	191
Installing and Removing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC Power Supply	192
Installing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC Power Supply	193
Removing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC Power Supply	193
Installing and Removing a Redundant Power Supply Adapter	194
Installing an RPS Adapter	195
Removing an RPS Adapter	195
Cisco 2911, 2921, and 2951 Power and RPS Error Messages	196
Replacing a Fan Tray or Air Filter	197
Before Hot-Swapping a Fan Tray	197
Replacing the Cisco 2911 Fan Tray	197
Replacing the Cisco 2911 Air Filter	198
Replacing the Cisco 2921 or 2951 Fan Tray	199
Replacing the Cisco 3900 Series Fan Tray	200
Replacing the Cisco 3900 Series Air Filter	201
Installing a FIPS Louver	203
Removing and Installing CompactFlash Memory Cards	204
Preventing Electrostatic Discharge Damage	204
Removing a CompactFlash Memory Card	204
Installing a CompactFlash Memory Card	206
Installing SFP Modules	207
Laser Safety Guidelines	209
Removing SFP Modules	210
Getting Software Licenses for the Router	213
Activating a New Software Package or Feature	213
RMA License Transfer	215
Additional Information	215
Online Insertion Removal and Hot-Swapping	217
OIR Procedures	218
Removing a Module	218
Removing a Voice Module	218
Inserting a Data or Voice Module	218

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4-16

Cisco 2900 and 3900 Series Hardware Installation

OL-18712-01

Chapter 4

Configuring the Router

Performing the Initial Configuration on the Router

Gateway of Last Resort

When default information is being passed along through a dynamic routing protocol, no further

configuration is required. The system periodically scans its routing table to choose the optimal default

network as its default route. In the case of RIP, there is only one choice, network 0.0.0.0. In the case of

IGRP, there might be several networks that can be candidates for the system default. The Cisco IOS

software uses both administrative distance and metric information to determine the default route

(gateway of last resort). The selected default route appears in the gateway of last resort display of the

show ip route

EXEC command.

If dynamic default information is not being passed to the software, candidates for the default route are

specified with the

ip default-network

global configuration command. In this usage, the

default-network

command takes an unconnected network as an argument. If this network appears in the

routing table from any source (dynamic or static), it is flagged as a candidate default route and is a

possible choice as the default route.

If the router has no interface on the default network, but does have a route to it, it considers this network

as a candidate default path. The route candidates are examined and the best one is chosen, based on

administrative distance and metric. The gateway to the best default path becomes the gateway of last

resort.

SUMMARY STEPS

enable

configure

terminal

ip routing

ip route

dest-prefix mask

next-hop-ip-address

[

admin-distance

] [

permanent

]

ip default-network

network-number

ip route

dest-prefix mask

next-hop-ip-address

end

show ip route

DETAILED STEPS

Command or Action

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•

Enter your password if prompted.

Step 2

configure

terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

ip routing

Example:

Router(config)# ip routing

Enables IP routing.