The TCP/IP Guide - PPP Standards

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These protocols define optional features used with PPP, such as compression and encryption (Table 28).

**Table 28: PPP Feature Protocol Standards**
RFC Number	Standard Name	Description
1962	The PPP Compression Control Protocol (CCP)	Defines a mechanism for compressing data sent over PPP links to improve performance. This standard describes how compression is negotiated between two devices on a PPP link. It is used in conjunction with several compression algorithms that actually do the compression of data.
1968	The PPP Encryption Control Protocol (ECP)	Defines a mechanism for encrypting data sent over PPP links to improve performance. This standard describes how encryption is negotiated between two devices. It is used with several encryption algorithms.
1989	PPP Link Quality Monitoring	Defines a protocol that lets PPP devices generate reports to each other about the quality of the link.
1990	The PPP Multilink Protocol (MP)	Defines a method for running PPP over a set of aggregated links, allowing two devices to use multiple low-bandwidth links as a single, high-bandwidth virtual link.
2125	The PPP Bandwidth Allocation Protocol (BAP) / The PPP Bandwidth Allocation Control Protocol (BACP)	Defines two support protocols that manage the allocation of bandwidth in links aggregated using the PPP Multilink Protocol (MP).

These protocols describe how PPP can be adapted to run over particular types of links, or that don't really fit into any of the other groups above. They are shown in Table 29.

**Table 29: PPP Application and Miscellaneous Standards**
RFC Number	Standard Name	Description
1618	PPP over ISDN	Describes application particulars for running PPP over ISDN links.
1973	PPP in Frame Relay	Describes how PPP may be modified to run over Frame Relay at layer two.
2290	Mobile-IPv4 Configuration Option for PPP IPCP	Defines changes to the PPP Internet Protocol Control Protocol (IPCP) to support Mobile IP.
2364	PPP Over AAL5	Defines a method for sending PPP frames over AAL5 (ATM); commonly called PPPoA.
2516	A Method for Transmitting PPP Over Ethernet (PPPoE)	Defines a technique for encapsulating PPP frames over Ethernet (PPPoE).
2615	PPP over SONET/SDH	Discusses how to encapsulate PPP frames over SONET/SDH links.