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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
78-19417-01
Chapter 8 Management Network Connectivity
TCP/IP and OSI Networking
8.6.1 Point-to-Point Protocol
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 Connectionless Network Protocol (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 point-to-point connections.
CTC automatically enables IP over PPP whenever you create an RS-DCC or MS-DCC. The RS-DCC or
MS-DCC can be provisioned to support OSI over PPP.
Table 8-7 TCP/IP and OSI Protocols
OSI Model IP Protocols OSI Protocols IP-OSI Tunnels
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
Layer 6
Presentation
• Administrative S
tate
4
4. Administrative State = Presentation layer
Layer 5
Session
• Session
Layer 4
Transport
• TCP
• UDP
• TP (Transport)
Class 4
• IP-over-CLNS
5
tunnels
5. CLNS = Connectionless Network Layer Service
Layer 3
Network
• IP
• OSPF
• CLNP
6
• ES-IS
7
• IS-IS
8
6. CLNP = Connectionless Network Layer Protocol
7. ES-IS = End System-to-Intermediate System
8. IS-IS = Intermediate System-to-Intermediate System
Layer 2 Data
link
• PPP • PPP
• LAP-D
9
9. LAP-D = Link Access Protocol on the D Channel
Layer 1
Physical
DCC, LAN, fiber,
electrical
DCC, LAN, fiber, electrical
