Configuring CHAP Using Names Other Than the Hostname Example

Single Identification Used on All Remote Sites

RemoteX(config)# interface bri0/0

RemoteX(config-if)# ip address

RemoteX(config-if)# encapsulation ppp

RemoteX(config-if)# dialer map ip name Server broadcast 3250233 RemoteX(config-if)# ppp authentication chap callin RemoteX(config-if)# ppp chap hostname AllSites


Single Username/Password Entry for All Remote Sites

Server(config)# username AllSites password sec

Server(config)# interface briO/O Server(config-if)# ip address 1O.1.1.1 2

Server(config-if)# encapsulation ppp

Server(config-if)# dialer map ip name AllSites broadcast 3442929 Server(config-if)# ppp authentication chap


© 2001, Cisco Systems, Inc. All rights reserved. Cisco CCIE Prep v1.0—Module 3-38

In this configuration, all remote sites will have a single identification they use to authenticate to the Access Server at the ISP. All remote sites use the username of "AllSites" with the shared secret password of "secret".

PPP Multilink

Multilink PPP (MPPP) provides a method for spreading traffic across multiple physical Wide Area Network (WAN) links while providing packet fragmentation and reassembly, proper sequencing, multivendor interoperability, and load balancing on inbound and outbound traffic.

R4(config)# interface briO/O

R4(config-if)# ip address R4 (config-if)# encapsulation ppp

R4(config-if)# dialer map ip name R1 broadcast 3441OOO

R4 (config-if)# ppp multilink

R4(config-if)# dialer load-threshold 128 outbound

© 2001, Cisco Systems, Inc. All rights reserved. Cisco CCIE Prep v1.0—Module 3-39

There are two basic methods for configuring MPPP. The first method, which is the simpler of the two, can be used only on Integrated Services Digital Network (ISDN) Basic Rate Interfaces (BRIs) and Primary Rate Interfaces (PRIs). The second involves the creation of a Dialer interface, which can be used with any type of WAN connection. The example shows an MPPP configuration using the first method.

The two commands highlighted work in concert to provide all the features of MPPP.

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