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Configuring PPP Services
2-10 117360-A Rev. A
Datagram Encapsulation
Before transmitting data across the link, PPP encapsulates data in a frame similar
to a high-level data link control (HDLC) frame (F
igure 2-3).
Figure 2-3. PPP-Encapsulated Frame
The parts of the PPP frame function as follows:
• The flag field marks the beginning and end of a frame. Peers on synchronous
lines exchange flags continuously when there are no frames to transmit.
• The address field indicates which device originated the frame.
• The control field shows the frame type (information or administrative).
• The protocol field indicates the operative network layer protocol.
• The data field contains the data one link sends to the other. Its length is less
than or equal to the MTU line size. The default maximum length is 1594
bytes; LCP negotiations determine the actual length.
• The frame check sequence (FCS) field shows the sequence order of the frame;
router hardware computes the FCS. A 16- or 32-bit cyclic redundancy check
(CRC) is at the end of each frame.
PPP Dial Services Support
Bay Networks dial services offer access to switched networks through dial-up line
connections (also called switched lines) that are active only when you choose to
use them. In contrast, a leased line is always available. If you transmit limited
amounts of data, or if your data transmission is intermittent, dial services may let
you run your network more effectively and economically.
PPP0003A
PPP frame
Flag
Address Control Protocol
Data
FCS Flag
1 byte 1 byte 1 byte1 byte 2 bytes Variable 2 or 4
bytes
- Configuring PPP 1
- Services 1
- Contents 5
- 117360-A Rev. A 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 17
- How to Get Help 17
- Chapter 1 19
- Starting PPP Services 19
- Summary of PPP Services 20
- Starting Configuration Tools 21
- Starting PPP 22
- Using the BCC 23
- Using Site Manager 23
- Deleting PPP Services 24
- Where to Go Next 25
- Chapter 2 27
- PPP Concepts 27
- PPP Overview 28
- • Password Authentication 29
- • Challenge Handshake 29
- Routing over a PPP Link 30
- Initializing a PPP Interface 31
- 2-6 117360-A Rev. A 32
- 2-8 117360-A Rev. A 34
- One-Way Authentication 35
- Datagram Encapsulation 36
- PPP Dial Services Support 36
- Dial-on-Demand 37
- Bandwidth-on-Demand 37
- Dial Backup 37
- PPP Multiline 38
- PPP Multilink 38
- Using PPP Multilink 39
- 2-14 117360-A Rev. A 40
- Figure 2-4. Multilink Circuit 40
- Balancing Traffic Loads 41
- Using Multilink Fragmentation 42
- 2-18 117360-A Rev. A 44
- Monitoring PPP Link Quality 46
- PPP Data Compression 48
- PPP Line Parameters 50
- Detecting Loopback Conditions 51
- 2-26 117360-A Rev. A 52
- PPP Interoperability 53
- Chapter 3 55
- Customizing PPP 55
- 3-2 117360-A Rev. A 56
- Enabling PPP on an Interface 57
- Setting Up Remote Addresses 58
- Configuring AppleTalk 60
- 3-8 117360-A Rev. A 62
- 3-10 117360-A Rev. A 64
- Table 3-1. PPP Modes 65
- 3-12 117360-A Rev. A 66
- Configuring Data Encryption 67
- Customizing PPP Lines 68
- Editing PPP Line Parameters 69
- Setting the Restart Timer 72
- Customizing PAP 81
- Customizing CHAP 84
- 3-34 117360-A Rev. A 88
- 3-36 117360-A Rev. A 90
- Disabling Loopback Checking 93
- 3-42 117360-A Rev. A 96
- Appendix A 99
- Configuring PPP Services 100
- A-2 117360-A Rev. A 100
- 101
- A-8 117360-A Rev. A 106
- PPP Parameters 107
- 110
- A-16 117360-A Rev. A 114
- 116
- A-20 117360-A Rev. A 118
- 119
- A-24 117360-A Rev. A 122
- A-26 117360-A Rev. A 124
- A-28 117360-A Rev. A 126
- Appendix B 127
- Default PPP Configuration 127
- B-2 117360-A Rev. A 128
- Default PPP Configuration 129
- Appendix C 131
- PPP Statistics 131
- C-2 117360-A Rev. A 132
- Table C-1. PPP Statistics 132
- 117360-A Rev. A Index-1 133
- 117360-A Rev. A Index-3 135
- 117360-A Rev. A Index-5 137
- 117360-A Rev. A Index-7 139
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