Technical data

ManualsBrandsCisco ManualsComputer equipment1604 - 1604 Bridge/router

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Routing across Modem Lines 6-7

Configuring the Dialing Access Server

Step 2 Associate a network to the RIP routing process:

Woodstock(config-router)# network 172.16.0.0

Woodstock(config-router)# exit

Woodstock(config)#

Step 3 Create a static default route. A static default route points to the answering access server’s

IP network number (in this case 172.16.10.0) via the next hop (in this case 172.16.10.1).

Static default routes are required because dynamic routes are lost when the link is down.

Woodstock(config)# ip route 172.16.10.0 255.255.255.0 172.16.10.1

Step 4 Conﬁgure a second default route, because the asynchronous interface is unnumbered

(refer to the section “Conﬁguring the Asynchronous Interface Dialing the DDR Call”). A

second static route is needed to tell the local access server (Woodstock) how to get to the

device at address 172.16.10.1. A mask of 255.255.255.255 is used to specify that this

route is a host address.

Woodstock(config)# ip route 172.16.10.1 255.255.255.255 async1

Conﬁguring the Ethernet Interface 0 for the Dialing Access Server

Perform the following task to conﬁgure the Ethernet interface 0 on the access server initiating

outgoing DDR calls (Woodstock):

Assign an IP address to the Ethernet interface 0:

Snoopy(config-router)# interface Ethernet0

Snoopy(config-if)# ip address 172.16.20.1 255.255.255.0

Conﬁguring the Asynchronous Interface Dialing the DDR Call

Perform the following steps to conﬁgure the asynchronous interface initiating DDR calls:

Step 1 Conﬁgure the asynchronous interface through which you need to place calls as IP

unnumbered to conserve IP addresses and assign the IP address for Ethernet interface 0

to it.

Woodstock(config-if)# interface async1

Woodstock(config-if)# ip unnumbered Ethernet0

Step 2 Encapsulate PPP on the interface.

Woodstock(config-if)# encapsulation ppp

Step 3 Specify asynchronous dynamic routing on the interface. The async dynamic routing

command allows routing protocols to be run over the asynchronous interface to resolve

IP routes dynamically. If the command is omitted, static routes can still be used.

Woodstock(config-if)# async dynamic routing

Step 4 Specify the IP address of opposite access server’s (Snoopy’s) Ethernet interface 0 as a

default IP address:

Woodstock(config-if)# peer default ip address 172.16.10.1