Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
Information About Configuring Serial Interfaces
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Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
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• IP Control Protocol (IPCP) to negotiate IP properties
• Multiprotocol Label Switching control processor (MPLSCP) to negotiate MPLS properties
• Cisco Discovery Protocol control processor (CDPCP) to negotiate CDP properties
• IPv6CP to negotiate IP Version 6 (IPv6) properties
• Open Systems Interconnection control processor (OSICP) to negotiate OSI properties
PPP uses keepalives to monitor the link state, as described in the “Keepalive Timer” section on page 508.
PPP supports the following authentication protocols, which require a remote device to prove its identity
before allowing data traffic to flow over a connection:
• 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 name of the remote device 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 NT or
Microsoft Windows 95 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.
Note For more information on enabling and configuring PPP authentication protocols, see the “Configuring
PPP on the Cisco ASR 9000 Series Router” module in this manual.
Use the ppp authentication command in interface configuration mode to enable CHAP, MS-CHAP, and
PAP on a serial interface.
Note Enabling or disabling PPP authentication does not effect the local router’s willingness to authenticate
itself to the remote device.
Multilink PPP
Multilink Point-to-Point Protocol (MLPPP) is supported on the following SPAs:
• 1-Port Channelized OC-12/DS0 SPAs and line cards
• 2-Port and 4-Port Channelized T3 SPAs
• 8-Port Channelized T1/E1 SPA
• 1-Port Channelized OC-3/STM-1 SPA
• 2-Port Channelized OC-12/DS0 SPA
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.
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