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13-30
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 13 Management Network Connectivity
13.7 13.7.1 Point-to-Point Protocol
13.7.1 Point-to-Point Protocol
PPP is a data link (Layer 2) encapsulation protocol that transports datagrams over point-to-point links.
Although PPP was developed to transport IP traffic, it can carry other protocols including the OSI CLNP.
PPP components used in the transport of OSI include:
• High-level data link control (HDLC)—Performs the datagram encapsulation for transport across
point-to-point links.
• Link control protocol (LCP)—Establishes, configures, and tests the point-to-point connections.
CTC automatically enables IP over PPP whenever you create an SDCC or LDCC. The SDCC or LDCC
can be provisioned to support OSI over PPP.
Table 13-10 TCP/IP and OSI Protocols
OSI Model IP Protocols OSI Protocols IP-OSI Mediation
Layer 7
Application
• TL1
• FTP
• HTTP
• Telnet
• IIOP
• TARP
1
1. TARP = TID Address Resolution Protocol
• TL1 (over
OSI)
• FTAM
2
• ACSE
3
2. FTAM = File Transfer and Access Management
3. ACSE = association-control service element
• T–TD
4
• FT–TD
5
4. T–TD = TL1–Translation Device
5. FT–TD = File Transfer—Translation Device
Layer 6
Presentation
• PST
6
6. PST = Presentation layer
Layer 5
Session
• Session
Layer 4
Transport
• TCP
• UDP
• TP (Transport)
Class 4
• IP-over-CLNS
7
tunnels
7. CLNS = Connectionless Network Layer Service
Layer 3
Network
• IP
• OSPF
• CLNP
8
• ES-IS
9
• IS-IS
10
8. CLNP = Connectionless Network Layer Protocol
9. ES-IS = End System-to-Intermediate System
10. IS-IS = Intermediate System-to-Intermediate System
Layer 2 Data
link
• PPP • PPP
• LAP-D
11
11. LAP-D = Link Access Protocol on the D Channel
Layer 1
Physical
DCC, LAN, fiber,
electrical
DCC, LAN, fiber, electrical