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Page 26 / 196 Scroll up to view Page 21 - 25
1-10
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1
Basic Router Configuration
Configuring Basic Parameters
For complete information about the command line commands, see the Cisco IOS Release 12.3
documentation set.
Step 3
login
Example:
Router(config)#
login
Router(config)#
Enables password checking at terminal session
login.
Step 4
exec-timeout
minutes
[
seconds
]
Example:
Router(config)#
exec-timeout 5 30
Router(config)#
Sets the interval that the EXEC command
interpreter waits until user input is detected. The
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.
Step 5
line
[
aux
|
console
|
tty
|
vty
]
line-number
Example:
Router(config)#
line vty 0 4
Router(config)#
Specifies a virtual terminal for remote console
access.
Step 6
password
password
Example:
Router(config)#
password aldf2ad1
Router(config)#
Specifies a unique password for the virtual
terminal line.
Step 7
login
Example:
Router(config)#
login
Router(config)#
Enables password checking at the virtual terminal
session login.
Step 8
end
Example:
Router(config)#
end
Router#
Exits line configuration mode, and returns to
privileged EXEC mode.
Command
Purpose
Page 27 / 196
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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1
Basic Router Configuration
Configuring Static Routes
Configuration Example
The following configuration shows the command-line access commands.
You do not need to input the commands marked “default.” These commands appear automatically in the
configuration file generated when you use the
show running-config
command.
!
line con 0
exec-timeout 10 0
password 4youreyesonly
login
transport input none
(default)
stopbits 1
(default)
line vty 0 4
password secret
login
!
Configuring Static Routes
Static routes provide fixed routing paths through the network. They are manually configured on the
router. If the network topology changes, the static route must be updated with a new route. Static routes
are private routes unless they are redistributed by a routing protocol. Configuring static routes on the
Cisco 850 and Cisco 870 series routers is optional.
Perform these steps to configure static routes, beginning in global configuration mode:
Command
Purpose
Step 1
ip route
prefix mask
{
ip-address
|
interface-type
interface-number
[
ip-address
]}
Example:
Router(config)#
ip route 192.168.1.0
255.255.0.0 10.10.10.2
Router(config)#
Specifies the static route for the IP packets.
For details about this command and additional
parameters that can be set, see the
Cisco IOS IP
Command Reference, Volume 2 of 4: Routing
Protocols
.
Step 2
end
Example:
Router(config)#
end
Router#
Exits router configuration mode, and enters
privileged EXEC mode.
For complete information on the static routing commands, see the Cisco IOS Release 12.3
documentation set. For more general information on static routing, see
Appendix B, “Concepts.”
Page 28 / 196
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Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1
Basic Router Configuration
Configuring Dynamic Routes
Configuration Example
In the following configuration example, the static route sends out all IP packets with a destination IP
address of 192.168.1.0 and a subnet mask of 255.255.255.0 on the Fast Ethernet interface to another
device with an IP address of 10.10.10.2. Specifically, the packets are sent to the configured PVC.
You do not need to enter the commands marked “(
default
).” These commands appear automatically in
the configuration file generated when you use the
show running-config
command.
!
ip classless (
default
)
ip route 192.168.1.0 255.255.255.0 10.10.10.2!
Verifying Your Configuration
To verify that you have properly configured static routing, enter the
show ip route
command and look
for static routes signified by the “S.”
You should see verification output similar to the following example.
Router#
show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
C
10.108.1.0 is directly connected, Loopback0
S* 0.0.0.0/0 is directly connected, FastEthernet0
Configuring Dynamic Routes
In dynamic routing, the network protocol adjusts the path automatically, based on network traffic or
topology. Changes in dynamic routes are shared with other routers in the network.
The Cisco routers can use IP routing protocols, such as Routing Information Protocol (RIP) or Enhanced
Interior Gateway Routing Protocol (EIGRP), to learn routes dynamically. You can configure either of
these routing protocols on your router.
Page 29 / 196
1-13
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1
Basic Router Configuration
Configuring Dynamic Routes
Configuring RIP
Perform these steps to configure the RIP routing protocol on the router, beginning in global
configuration mode:
Command
Task
Step 1
router rip
Example:
Router>
configure terminal
Router(config)#
router rip
Router(config-router)#
Enters router configuration mode, and enables RIP
on the router.
Step 2
version
{
1
|
2
}
Example:
Router(config-router)#
version 2
Router(config-router)#
Specifies use of RIP version 1 or 2.
Step 3
network
ip-address
Example:
Router(config-router)#
network 192.168.1.1
Router(config-router)#
network 10.10.7.1
Router(config-router)#
Specifies a list of networks on which RIP is to be
applied, using the address of the network of
directly connected networks.
Step 4
no auto-summary
Example:
Router(config-router)#
no auto-summary
Router(config-router)#
Disables automatic summarization of subnet routes
into network-level routes. This allows subprefix
routing information to pass across classful network
boundaries.
Step 5
end
Example:
Router(config-router)#
end
Router#
Exits router configuration mode, and enters
privileged EXEC mode.
For complete information on the dynamic routing commands, see the Cisco IOS Release 12.3
documentation set. For more general information on RIP, see
Appendix B, “Concepts.”
Page 30 / 196
1-14
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
Chapter 1
Basic Router Configuration
Configuring Enhanced IGRP
Configuration Example
The following configuration example shows RIP version 2 enabled in IP network 10.0.0.0 and
192.168.1.0.
Execute the
show running-config
command from privileged EXEC mode to see this configuration.
!
router rip
version 2
network 10.0.0.0
network 192.168.1.0
no auto-summary
!
Verifying Your Configuration
To verify that you have properly configured RIP, enter the
show ip route
command and look for RIP
routes signified by “R.” You should see a verification output like the example shown below.
Router#
show ip route
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
C
10.108.1.0 is directly connected, Loopback0
R
3.0.0.0/8 [120/1] via 2.2.2.1, 00:00:02, Ethernet0/0
Configuring Enhanced IGRP
Perform these steps to configure Enhanced IGRP (EIGRP), beginning in global configuration mode:
Command
Purpose
Step 1
router eigrp
as-number
Example:
Router(config)#
router eigrp 109
Router(config)#
Enters router configuration mode, and enables
EIGRP on the router. The autonomous-system
number identifies the route to other EIGRP routers
and is used to tag the EIGRP information.

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