Configuring Ppp And Mp; Ppp Overview; Ppp Link Establishment Process - HPE FlexNetwork MSR Series Comware 5 Layer 2 - Wan Access Configuration Manual

Configuring PPP and MP

The MSR93X router does not support MP.

PPP overview

Point-to-Point Protocol (PPP) is a link layer protocol that carries network layer packets over
point-to-point links. It provides user authentication, supports synchronous/asynchronous
communication, and allows for easy extension.
PPP includes the following protocols:
•
Link control protocol (LCP)—Establishes, tears down, and monitors data links.
•
Network control protocol (NCP)—Negotiates the packet format and type for data links.
•
Authentication protocols—Provide network security. Protocols include Password
Authentication Protocol (PAP), Challenge Handshake Authentication Protocol (CHAP),
Microsoft CHAP (MS-CHAP), and Microsoft CHAP Version 2 (MS-CHAP-V2).

PPP link establishment process

Figure 2
shows the PPP link establishment process.
Figure 2 PPP link establishment process
Dead
Initially, PPP is in Link Dead phase. After the physical layer goes up, PPP enters the Link
1.
Establishment phase (Establish).
In the Link Establishment phase, the LCP negotiation is performed. The LCP configuration
2.
options include Authentication-Protocol, Async-Control-Character-Map (ACCM),
Protocol-Field-Compression (PFC), Address-and-Control-Field-Compression (ACFC), and MP.
If the negotiation fails, LCP reports a Fail event, and PPP returns to the Dead phase. If the
negotiation succeeds, LCP enters the Opened state and reports an Up event, indicating that the
underlying layer link has been established. (At this time, the PPP link is not established for the
network layer, and network layer packets cannot be transmitted over the link.)
If authentication is configured, the PPP link enters the Authentication phase, where PAP, CHAP,
3.
MS-CHAP, or MS-CHAP-V2 authentication is performed. If the supplicant fails to pass the
authentication, the link reports a Fail event and enters the Link Termination phase, where the
link is torn down and LCP goes down. If the supplicant passes the authentication, a Success
event is reported.
If a network layer protocol is configured, the PPP link enters the Network-Layer Protocol phase
4.
for NCP negotiation, such as IPCP negotiation or IPv6CP negotiation. If the NCP negotiation
succeeds, the link goes up and becomes ready to carry negotiated network-layer protocol
packets. If the NCP negotiation fails, NCP reports a down event and enters the Link
Termination phase.
Up
Establish
Fail
Down
Terminate
Opened
Authenticate
Fail
Network
Closing
4
Success
/None