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Cuda 12000 IP Access Switch CLI-based Administration Guide
Configuring Point-to-Point Protocol (PPP) 137
Configuring Point-to-Point Protocol (PPP)
PPP is well-suited for delivery of data over SONET networks, as SONET links
are provisioned as point-to-point circuits. The system encapsulates IP
datagrams using PPP, then places the PPP frames into the SONET payload
before transmission over the SONET circuit. PPP also provides security
protocols that support the authentication of peers.
PPP administration on a POS interface includes:
■ Configuring PPP Security — POS interfaces support both Challenge
Handshake Authentication Protocol (CHAP) and Password Authentication
Protocol (PAP) so that only trusted devices can participate in the creation
of a point-to-point circuit.
■ Configuring LCP — As part of establishing the PPP connection, a POS
interface uses Link Control Protocol (LCP) packets to configure and test
the data link.
■ Enabling NCP — A Network Control Protocol (NCP) is used to configure
and enable network layer protocol communication. In this case, the
network layer protocol used over the SONET circuit is IP; the NCP used to
enable transmission of IP datagrams is the IP Control Protocol (IPCP).
PPP encapsulation over SONET is described in RFC 2615.