User`s guide

104 XSR User’s Guide
PPP Features Chapter 6
Configuring PPP
 Authentication of peer entities through:
– Password Authentication Protocol (PAP)
– Challenge Handshake Authentication Protocol (CHAP)
– Microsoft Challenge Handshake Authentication Protocol (MS-
CHAP)
 Link Quality Monitoring (LQM) procedures as defined by RFC-1989
 VJ/IP header compression
 No restriction on frame size; default is 1500 octets for the information
field - as defined by RFC-1661
 Self-Describing Padding and FCS (16-bytes) as defined by RFC-1570
 Outbound Dialing
 16-bit Fast Check Sequence
 The following parameters are negotiated during link level
configuration (as defined by RFC-1471):
– Maximum size of the packet that can be received on a link (MRU)
– Protocol to be used for authentication
– Asynchronous Character Control Map (ACCM)
– The protocol to be used for Link Quality Monitoring
– FCS
– Magic number
– Padding
 Bandwidth Allocation Protocol (BAP/BACP) as defined by RFC-2125
Link Control Protocol (LCP)
The Link Control Protocol (LCP) handles the functions of establishing,
configuring and terminating the PPP link. These functions are as follows:
 Establish, configure and terminate the PPP link.
 Initiate authentication and link quality monitoring procedures, if set.
 Initiate network layer configuration option negotiation procedures.
Link level configuration options to be negotiated with the peer are set on per-
link basis. After the lower layer is operationally up, link establishment and
configuration negotiation is performed. If a configuration option is not
included in the LCP packet, the default value for that option is assumed. LCP
starts authentication and LQM procedures after the link is built. After the link
is authenticated successfully, configured NCP protocols are initiated.