Technical data

5-4 Dial Solutions Quick Configuration Guide
Configuring Point-to-Point Protocol (PPP) Access
Step 5 Configure an OSPF network type of point-to-multipoint on the Ethernet interface 0 on the
access server:
2511(config-router)# interface ethernet 0
2511(config-if)# ip ospf network point-to-multipoint
Step 6 Identify the IP domain name and IP name server on the LAN segment:
2511(config-if)# exit
2511(config)# ip domain-name eapp.com
2511(config)# ip name-server 172.16.42.128
To configure IGRP instead of OSPF routing, issue the router igrp process-id global configuration
command, then associate the network with the IGRP process ID by issuing the network address
router configuration command. For example, you enter the following commands to configure IGRP
routing:
2511(config-if)# router igrp 101
2511(config-router)# network 172.16.42.0
You can also configure a number of other routing protocols with IP, including RIP, IS-IS, BGP, EGP,
GDP, IRDP, and IP multicast routing. For more information about configuring any of these routing
protocols, refer to the Network Protocols Configuration Guide, Part 1 in the Cisco IOS
documentation.
Configuring PPP Encapsulation
To enable IP dial-in, configure PPP encapsulation on asynchronous interfaces, as follows:
Step 1 To conserve IP addresses, configure the asynchronous interfaces as unnumbered and
assign the IP address of the Ethernet interface to them:
2511(config)# interface group-async2
2511(config)# group-range 1 16
2511(config-if)# ip unnumbered ethernet0
Step 2 Specify PPP encapsulation on asynchronous interfaces to which you will allow PPP
connections:
2511(config-if)# encapsulation ppp
Step 3 Enable interactive mode on asynchronous interfaces:
2511(config-if)# async mode interactive
Step 4 Configure lines on the access server to detect incoming PPP packets and permit a PPP
client to connect to the network automatically. The following example shows lines 1 to 8
on an access server being configured to autoselect incoming PPP packets:
2511(config-if)# line 1 8
2511(config-line)# autoselect ppp
Note You do not need to configure autoselect for incoming PPP packets. You can issue the
async mode dedicated command in place of the async mode interactive command. If you use
dedicated asynchronous mode on a set of interfaces, users are not automatically connected to the
network. Rather, they are connected to the EXEC facility on the access server, and then they must
issue the ppp command to connect to network resources. For more information, refer to the Dial
Solutions Configuration Guide in the Cisco IOS documentation.