Configuring And Monitoring Ppp Functions - Extreme Networks PoS Installation And User Manual

Configuring and Monitoring PPP Functions

• Challenge Handshake Authentication Protocol (CHAP)
• Password Authentication Protocol (PAP)
• IP Control Protocol (IPCP)
• Bridging Control Protocol (BCP)
• MultiProtocol Label Switching Control Protocol (MPLSCP)
• Extreme Discovery Protocol Control Protocol (EDPCP)
Link Control Protocol. The Link Control Protocol (LCP) establishes a logical
connection with the peer LCP entity through an exchange of configuration packets.
Data traffic cannot flow over the SONET link until LCP has successfully established this
connection. LCP is also responsible for negotiating options that are independent of
particular network layer protocols, such as the Quality Report, Authentication Protocol,
and Maximum Receive Unit options.
Quality Protocol Configuration Option. The LCP Quality Protocol configuration
option can be used to specify the use of the Link Quality Report (LQR) Protocol to
monitor the quality of the SONET link. If the LQR Protocol detects that the quality of
the link is less than a configured threshold, all network layer protocols running over the
link are brought down. This process of determining data loss and link viability is
referred to as Link Quality Monitoring (LQM).
Link Maintenance Configuration Option. In addition to the LQR option, the Extreme
Networks implementation of PPP also provides a Link Maintenance configuration
option. When link maintenance is enabled on a port and that port is not receiving data
packets, the link maintenance facility periodically transmits LCP echo-request packets. If
an echo-reply is not received within a configured interval, LCP brings the link down.
Authentication Protocols. The Extreme Networks implementation of PPP uses the
Challenge Handshake Authentication Protocol (CHAP) and the Password
Authentication Protocol (PAP) to authenticate peer network elements. PAP is a simple
protocol based on a clear-text user name and password pair, while CHAP is a stronger
authentication protocol that uses the Message Digest, Version 5 (MD5) one-way hash
algorithm. In the use of either protocol, if authentication fails, the connection with the
peer is terminated.
IP Control Protocol. IPCP is a member of a family of Network Control Protocols
(NCPs) defined for use with PPP. IPCP establishes and configures a connection to
transport IP datagrams efficiently across a PPP link between two routers. When IPCP is
Packet Over SONET Module Installation and User Guide 3-23