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c.Enable PPP:
LosAngeles(config-if)# encapsulation ppp
d.Enable DDR:
LosAngeles(config-if)# dialer in-band
e.Specify the amount of time (in seconds) that the line can be idle before it is 
disconnected. For example:
LosAngeles(config-if)# dialer idle-timeout 300
Set the number of packets to be held in the outgoing queue to 10. In the 
following example, if an ISDN connection does not exist yet, the hold queue 
holds up to 10 packets before dropping them.
LosAngeles(config-if)# dialer hold-queue 10
f.Define the load level that must be exceeded on the first ISDN B channel 
before the second B channel is brought up.The load variable represents a 
utilization percentage and is a number between 1 and 255, where 255 is
100 percent. 
LosAngeles(config-if)# dialer load-threshold 10 outbound 
NoteEnter outbound to calculate the load using outbound data only, 
inbound to calculate the load using inbound data only, and either to 
set the maximum calculated load as the larger of the outbound and 
inbound loads.
g.Assign this interface to dialer access group 1. The dialer access group is 
defined later in this procedure.
LosAngeles(config-if)# dialer-group 1
h.Configure CHAP. To configure PAP, skip this step, and go to step i. This 
command enables CHAP and specifies authentication on incoming and 
outgoing calls.
LosAngeles(config-if)# ppp authentication chap 
						

							 
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Configure PAP. To configure CHAP, go to step g. This command enables 
PAP and specifies authentication on incoming and outgoing calls.
LosAngeles(config-if)# ppp authentication pap
i.Enable multilink PPP:
LosAngeles(config-if)# ppp multilink
IP Routing Configuration
To configure IP routing, perform the following steps on the PC connected to the 
other router. 
Step 1Change to global configuration mode:
LosAngeles(config-if)# exit
LosAngeles(config)#
Step 2Specify the subnet 0.0.0.0 for your IP network:
LosAngeles(config)# ip subnet-zero
Step 3Disable the IP DNS-based host name-to-address translation:
LosAngeles(config)# no ip domain-lookup
Step 4Configure the LAN interface by performing the following steps:
a.Specify parameters for the LAN interface:
LosAngeles(config)# interface ethernet0
b.Set an IP address and subnet mask for the LAN interface. For example:
LosAngeles(config)# ip address 10.2.0.1 255.255.0.0
Step 5Follow these steps to specify characteristics of the dialer rotary group that were 
created earlier:
a.Change to global configuration mode:
LosAngeles(config-if)# exit
LosAngeles(config)# 
						

							 
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b.Specify parameters for the dialer rotary group:
LosAngeles(config)# interface dialer 1
c.Set an IP address and subnet mask for this interface:
LosAngeles(config-if)# ip address 10.3.1.2 255.255.0.0
d.To configure the WAN interface to call a site or to receive calls from a site, 
create a dialer map in global configuration mode. 
In this example, this command is entered twice, once for each B channel. The 
next hop address is 10.3.1.1, the host name is SanJose, and the dial strings are 
408555111100 and 408555222200:
LosAngeles(config-if)# exit
LosAngeles(config)# dialer map ip 10.3.1.1
 name SanJose speed 56 408555111100
LosAngeles(config)# dialer map ip 10.3.1.1 name SanJose 
speed 56 408555222200
Step 6Follow these steps to configure how the IP routing protocol learns routes:
a.Change to global configuration mode:
LosAngeles(config-if)# exit
LosAngeles(config)#
b.Set up all IP addresses to be treated as classless:
LosAngeles(config)# ip classless
c.Set up static routes. In the following example, the destination (San Jose) 
network is 10.1.0.0, the subnet mask is 255.255.0.0, and the San Jose router 
ISDN interface is 10.3.1.1.
LosAngeles(config)# ip route 10.1.0.0 255.255.0.0 10.3.1.1
NoteYou must configure the route to the San Jose network as well as the 
route to the San Jose router ISDN interface. The route to the San Jose 
router is through the dialer 0 port of the LosAngeles router.
Step 7Specify that dialer list 1 permits dialing by the IP routing protocol:
LosAngeles(config)# dialer-list 1 protocol ip permit 
						

							 
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							CHAPTER
 
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3
Configuring Advanced Networks
This chapter describes the following configurations:
Private IP network to Internet and corporate network
Remote network to two corporate networks
The following features can be configured in your network:
Dial-on-demand routing (DDR) using snapshot routing
Leased Integrated Services Digital Network (ISDN) line
Dynamic routing using Routing Information Protocol (RIP), including 
triggered extensions to RIP, and Enhanced Interior Gateway Routing 
Protocol (EIGRP)
Microsoft Windows (configuring Cisco 800 series routers to function in a 
Windows operating system environment)
Dynamic Host Configuration Protocol (DHCP) relay
Dial-on-demand ISDN line activation control
Network access restrictions
Dial-in authentication and authorization
X.25 on ISDN Basic Rate Interface (BRI)
Always on/dynamic ISDN (AO/DI)
Advanced telephone features, such as ISDN voice priority and distinctive 
ringing 
						

							 
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Cisco recommends that you familiarize yourself with the features in the 
configuration examples to help you decide which features you wish to include in 
your network.
NoteCertain protocols (IP, User Datagram Protocol [UDP], and Network Time 
Protocol [NTP]) send updates that can cause an ISDN line to be activated 
excessively. For information on preventing this situation, refer to the “Controlling 
the DDR ISDN Line Activation” section on page 3-26.
Before Configuring Advanced Networks or Features
Before configuring the advanced networks or the advanced features, you must do 
the following:
Step 1Order your ISDN line from your telephone service provider. For complete 
information on ordering your ISDN line, see Appendix D, “Provisioning an ISDN 
Line.”
Step 2While ordering your ISDN line, gather the following information from your 
telephone service provider:
ISDN switch type.
Service profile identifiers (SPIDs). In North America only, telephone service 
providers assign SPIDs. SPIDs identify the ISDN B channels. The SPID 
format is generally an ISDN telephone number with additional numbers, such 
as 40855522220101. Depending on the switch type that supports your ISDN 
line, your ISDN line could be assigned zero, one, or two SPIDs.
ISDN local directory numbers (LDNs), which are the local ISDN telephone 
numbers of your routers, such as 4085552222 and 5553333.
NoteThe format of the LDN varies from region to region, depending on the 
telephone service provider. In some regions, you need to add the area 
code to the telephone number. Find out from your local telephone 
service provider whether or not you need to specify an area code for 
the LDN. 
						

							 
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Step 3If you are setting up an Internet connection, gather the following information 
from your Internet service provider (ISP):
PPP client name that the ISP assigns as your login name
PPP authentication type, either Challenge Handshake Authentication 
Protocol (CHAP) or Password Authentication Protocol (PAP)
PPP password to access your ISP account
IP address information: the IP address and subnet mask of the ISP ISDN 
interface
ISP telephone number
Step 4If you are setting up a connection to a corporate network, you and the network 
administrator of the corporate network must decide on or generate the following 
information for the WAN interfaces of your routers and share this information:
PPP authentication type, either CHAP or PAP
PPP client name to access the router
PPP password to access the router
Telephone number assigned to the telephone interface of your router
Step 5If you are setting up IP routing, collect information on the addressing scheme for 
your IP network.
Connecting a Private IP Network to the Internet and 
a Corporate Network
In the network example shown in Figure 3-1 and Ta b l e 3 - 1, the Cisco 800 series 
router connects a private IP network to an ISP and a corporate network. In this 
network, the ISP assigns a registered IP address for the WAN interface only.  
						

							 
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Figure 3-1 Connecting Private IP Network to Internet and Corporate Network
Callout 
Number Description
1Private network
2Site 1
3ISDN
4Internet service provider
5Site 2
10.0.0.0
74932
3600 800
3
21
4
5 
						

							 
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Features Used
This network uses the following features on the LAN:
IP routing
DHCP server (optional)
When your router is acting as a DHCP server, workstations configured as DHCP 
clients are automatically assigned an IP address and subnet mask. 
This network uses the following features on the WAN:
IP routing
PPP
NAT overload
Internet Protocol Control Protocol (IPCP)
CHAP or PAP over PPP
With NAT overload configured, your router can use one address for multiple 
hosts. With IPCP configured, your router can automatically negotiate its IP 
address from the router it is attempting to connect to.
You can use CHAP or PAP as the PPP authentication protocol. Cisco recommends 
using CHAP, because it is more secure.
For the ISDN connection, you can use one of the following options:
DDR using snapshot routing (the ISDN line is activated only when needed)
Permanent ISDN line lease
For complete information on these options, including how to configure them, see 
the “Configuring the ISDN Line” section on page 3-19.
The IP routing protocol can use either RIP or EIGRP to learn routes dynamically. 
You can also use triggered extensions to RIP to control when RIP sends routing 
updates. For information on how to configure these options, see the “Configuring 
Dynamic Routing” section on page 3-23. 
						

							 
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Configuring the Cisco 800 Series Router
NoteBefore you begin to configure your router, review the “Before Configuring 
Advanced Networks or Features” section on page 3-2.
Starting from global configuration mode, follow these steps to configure the 
Cisco 800 series router in the private IP network to connect to the Internet and the 
corporate network. For more information on the commands used, refer to the 
Cisco IOS documentation.
Command Purpose
Step 1router# configure terminalEnter global configuration mode.
Step 2router(config)# hostname c804Enter the router name.
Step 3c804(config)# enable secret 804passwordEnter the password.
Step 4c804(config)# pots country usOptional. If you have a Cisco 803 router that 
is connected to telephones, fax machines, or 
modems, specify the country where your 
router is located. Specifying a country 
configures the country-specific default 
settings for each physical characteristic.
Step 5c804(config)# interface bri0
c804(config-if)# isdn switch-type basic-ni
c804(config-if) exitChange to interface configuration mode, set 
the ISDN switch type, and return to global 
configuration mode.
Step 6c804(config)# ip subnet-zeroSet the router to recognize the zero subnet 
range as a valid range of addresses.
Step 7c804(config)# ip dhcp pool 
DHCPpoolLAN_0Optional. Configure your router as a DHCP 
server. This step specifies the DHCP relay 
pool name.
Step 8c804(dhcp-config)# network 10.0.0.0 
255.255.255.0For configuring DHCP only. Set the DHCP 
pool of addresses.
Step 9c804(dhcp-config)# dns-server 
192.168.1.100For configuring DHCP only. Set the IP 
address of the DNS server.