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Chapter 4

Configuring the Serial Interface

PPP uses keepalives to monitor the link state, as described in the

page

PPP supports the following authentication protocols, which require a remote device to prove its identity

before allowing data traffic to flow over a connection:

•

Use the ppp authentication command in interface configuration mode to enable CHAP, MS-CHAP, and

PAP on a serial interface.

Enabling or disabling PPP authentication does not effect the local router's willingness to authenticate

Note

itself to the remote device.

Multilink PPP

Multilink Point-to-Point Protocol (MLPPP) is supported on the Cisco 800M Series ISR serial interface.

MLPPP provides a method for combining multiple physical links into one logical link. The

implementation of MLPPP combines multiple PPP serial interfaces into one multilink interface. MLPPP

performs the fragmenting, reassembling, and sequencing of datagrams across multiple PPP links.

MLPPP provides the same features that are supported on PPP Serial interfaces with the exception of

QoS. It also provides the following additional features:

•

Keepalive Timer

Cisco keepalives are useful for monitoring the link state. Periodic keepalives are sent to and received

from the peer at a frequency determined by the value of the keepalive timer. If an acceptable keepalive

response is not received from the peer, the link makes the transition to the down state. As soon as an

acceptable keepalive response is obtained from the peer or if keepalives are disabled, the link makes the

transition to the up state.

4-43.

Challenge Handshake Authentication Protocol (CHAP)—CHAP authentication sends a challenge

message to the remote device. The remote device encrypts the challenge value with a shared secret

and returns the encrypted value and its name to the local router in a response message. The local

router attempts to match the remote device's name with an associated secret stored in the local

username or remote security server database; it uses the stored secret to encrypt the original

challenge and verify that the encrypted values match.

Microsoft Challenge Handshake Authentication Protocol (MS-CHAP)—MS-CHAP is the Microsoft

version of CHAP. Like the standard version of CHAP, MS-CHAP is used for PPP authentication; in

this case, authentication occurs between a personal computer using Microsoft Windows and a Cisco

router or access server acting as a network access server.

Password Authentication Protocol (PAP)—PAP authentication requires the remote device to send a

name and a password, which are checked against a matching entry in the local username database

or in the remote security server database.

Fragment sizes of 128, 256, and 512 bytes

Long sequence numbers (24-bit)

Lost fragment detection timeout period of 80 ms

Minimum-active-links configuration option

LCP echo request/reply support over multilink interface

Full T1 and E1 framed and unframed links

Cisco 800M Series Integrated Services Routers Software Configuration Guide

Information About Configuring Serial Interfaces

"Keepalive Timer" section on