Intro to router_config

Router user interface

• The Cisco IOS software uses a command-line interface
(CLI) as the traditional console environment.
• This environment is accessible through several methods:
– Console
– AUX port (modem)
– Telnet

Establishing a HyperTerminal session

Router

Console port
Terminal or a
PC with
Rollover cable
terminal
emulation
software

Com1 or Com2 serial port

Take the following steps to connect a terminal to the console port on the router:
• Connect the terminal using the RJ-45 to RJ-45 rollover cable and an RJ-45 to
DB-9 or RJ-45 to DB-25 adapter.
• Configure the terminal or PC terminal emulation software for 9600 baud, 8 data
bits, no parity, 1 stop bit, and no flow control.

Establishing a HyperTerminal session

=

• Important: A console connection is not the same as a
network connection!

Logging into the router

• Two commands can be used to set a password used to access privileged
EXEC mode: enable password and enable secret
• The following are specific modes that can also be accessed from the global
configuration mode:
– Interface
– Subinterface
– Line
– Router
– Route-map

CLI command modes

Router>enable
The command Exit
Router#configure terminal
will take you up one
Router(config)# interface fa 0/0
Router(config-if)# level

Configuring a router name

Router#config t
Router(config)#hostname Tokyo
Tokyo(config)#

Configuring a serial interface

Configuring an IP Address on an interface…
Router(config)#interface serial 0/0
Router(config-if)#ip address <ip address> <netmask>

show ip interface command

Router# show ip interface brief

Interface IP-Address OK? Method Status Protocol
Ethernet0 131.108.1.11 YES manual up up
Serial0 198.135.2.49 YES manual administratively down down

What is wrong here? The administrator has either done a
“shutdown” on the interface or has forgotten to do a “no shutdown”.

• A serial interface will not show “up” and “up” unless both
ends are properly configured (mostly) and the no shutdown
command is used.
• If one router’s configuration looks okay, check the other
router’s configuration.

Configuring a serial interface
Lab DCE DTE

Real world

• On serial links that are directly interconnected, as in a lab environment,
one side must be considered a DCE and provide a clocking signal.
• The clock is enabled and speed is specified with the clock rate
command.

Router(config)#interface serial 0/0
Router(config-if)#clock rate 56000 (on DCE end Only)
Router(config-if)#no shutdown

Configuring an Ethernet Interface

Configuring a Dynamic Routing Protocol:
Configuring RIPv1

First, RIP is enabled on each router.

From global configuration you will enter the command (the
default is RIPv1):
Router(config)#router rip

Second, Once you are in the Router RIP configuration sub-
mode, all you need to do is enter the classful network
address for each directly connected network, using the
network command.
Router(config-router)#network directly-
connected-classful-network-address

Example
First, we Configure the interfaces on
each router

SanJose2
hostname SanJose2
interface ethernet 0
ip add 192.168.1.1 255.255.255.0
interface serial 0
ip add 192.168.2.1 255.255.255.0

SanJose1
hostname SanJose1
interface ethernet 0
ip add 192.168.3.1 255.255.255.0
interface serial 0
ip add 192.168.2.2 255.255.255.0
clockrate 64000
interface serial 1
ip add 192.168.4.2 255.255.255.0
clockrate 64000

When done configuring the Baypointe
hostname Baypointe
interfaces use the interface ethernet 0
ip add 192.168.5.1 255.255.255.0
command: show ip interface serial 0

interface brief ip add 192.168.4.1 255.255.255.0

Second, we configure RIPv1

Here are the commands for each router:

SanJose2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SanJose2(config)#router rip
SanJose2(config-router)#network 192.168.1.0

Baypointe#configure terminal
Baypointe(config)#router rip
Baypointe(config-router)#network 192.168.4.0
Baypointe(config-router)#network 192.168.5.0

SanJose1#configure terminal
SanJose1(config)#router rip

Third, We check on the routing table for each
router

SanJose2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M -
mobile, B - BGP
<omitted>
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, *
- candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set

R 192.168.4.0/24 [120/1] via 192.168.2.2, 00:00:10,
Serial0
R 192.168.5.0/24 [120/2] via 192.168.2.2, 00:00:10,
Serial0
C 192.168.1.0/24 is directly connected, Ethernet0
C 192.168.2.0/24 is directly connected, Serial0
R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:10,
Serial0
SanJose2#

router

SanJose1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M
- mobile, B - BGP
<omitted>
R 192.168.5.0/24 [120/1] via 192.168.4.1, 00:00:12,
Serial1
R 192.168.1.0/24 [120/1] via 192.168.2.1, 00:00:10,
Serial0

router

Baypointe#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M -
mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF
inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external
type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E
- EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * -
candidate default
U - per-user static route, o - ODR

R 192.168.1.0/24 [120/2] via 192.168.4.2, 00:00:23, Serial0
R 192.168.2.0/24 [120/1] via 192.168.4.2, 00:00:23, Serial0
R 192.168.3.0/24 [120/1] via 192.168.4.2, 00:00:23, Serial0

copy running-config startup-config

During bootup

running-config
RAM
startup-config
Router# copy running-config startup-config

• Changes to the router are automatically put in the running-config file.
• If the router loses power or reboots, everything in RAM is lost including the running-
config file.
• To make sure the changes to the router’s configuration remain saved, you must copy
the running-config from RAM into the startup-config into NVRAM:


copy running-config startup-config
Or
Router# copy running startup
OR
Router# copy run start
OR
Any usage of the command or parameters, so that they are still uniquely recognizable .

WARNING
• Using an incorrect configuration file name could overwrite the router’s IOS in flash, as the router believes
you are trying to copy a blank file into flash.

Router#copy running-config start-up
**** NOTICE **** Incorrect file name!
Flash load helper v1.0
This process will accept the copy options and then terminate
the current system image to use the ROM based image for the copy.
Routing functionality will not be available during that time.
If you are logged in via telnet, this connection will terminate.
Users with console access can see the results of the copy operation.
---- ******** ----
Proceed? [confirm]^C
%Copy cancelled by user request.
Router#
Press <control> C

Examining the show commands (typed from
Privileged Mode)
• Show ip interface Brief: Shows the
status of the interfaces along with their IP
Addresses
• show startup-configuration –
Displays the saved configuration located in
NVRAM
• show running-configuration –
Displays the configuration currently running
in RAM

How to Reset The Router

1. Router> enable
2. Router# erase start (Press enter to confirm): This step
erases the configuration file
3. Router# Reload : This step soft-boots the router
4. After the router reloads, the following question will show:
“Would you like to enter the setup mode”, Please answer
“no” to that question.
5. The router should now take you to user mode: Router>

Note: If asked for a password, use the password system in
the next slide

Router Passwords Used in the Cisco Lab
Will not be used for the VoIP Labs
Privilege Password cisco

Console password conpass

VTY 0 4 password vtypass

Auxiliary auxpass

Intro to router_config

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Intro to router_config