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PPP Concepts
114068 Rev. A 2-9
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.
PPP is automatically configured on lines that you select for dial services. PPP,
with either CHAP or PAP, implements a router identification mechanism that dial
services require.
PPP 0003A
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
- Bay Networks Software License 3
- Contents 5
- 114068 Rev. A vii 7
- 114068 Rev. A ix 9
- 114068 Rev. A xi 11
- About This Guide 13
- Before You Begin 14
- Conventions 14
- Acronyms 15
- 114068 Rev. A xvii 17
- Bay Networks Customer Service 18
- World Wide Web 19
- Customer Service FTP 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- Starting PPP 23
- PPP Tasks 24
- Where to Go Next 25
- Router Router 27
- Synchronous Line 27
- PPP0001A 27
- 2-2 114068 Rev. A 28
- Routing over a PPP Link 29
- Initializing a PPP Interface 30
- PPP Concepts 31
- Router A Router B 32
- PPP0002A 32
- Datagram Encapsulation 34
- PPP Dial Services Support 35
- PPP Multiline 36
- PPP Multilink 37
- PPP0005A 38
- Circuit 38
- Bundle with 2 Links 38
- Balancing Traffic Loads 40
- Using Multilink Fragmentation 40
- PPP0004A 44
- PPP Data Compression 45
- 2-20 114068 Rev. A 46
- PPP Line Parameters 48
- Detecting Loopback Conditions 49
- PPP Interoperability 50
- Chapter 3 53
- Customizing PPP 53
- Setting Up Remote Addresses 54
- Configuring AppleTalk 56
- Enabling Bridging 57
- Enabling Ethernet Bridging 57
- Enabling FDDI Bridging 57
- Enabling Token Ring Bridging 57
- 3-6 114068 Rev. A 58
- 3-8 114068 Rev. A 60
- Customizing PPP Lines 61
- Editing PPP Line Parameters 62
- Setting the Restart Timer 63
- 3-12 114068 Rev. A 64
- 3-14 114068 Rev. A 66
- Customizing PAP 67
- 3-16 114068 Rev. A 68
- Customizing CHAP 69
- 3-18 114068 Rev. A 70
- 3-20 114068 Rev. A 72
- 3-22 114068 Rev. A 74
- Disabling Loopback Checking 76
- Deleting PPP 76
- Appendix A 79
- A-8 114068 Rev. A 86
- 89
- A-12 114068 Rev. A 90
- A-16 114068 Rev. A 94
- 95
- A-18 114068 Rev. A 96
- 98
- Configuring PPP Services 100
- A-22 114068 Rev. A 100
- PPP Parameters 101
- 102
- (continued) 105
- (continued) 106
- 114068 Rev. A Index-1 111
- 114068 Rev. A 112
- 114068 Rev. A Index-3 113
- 114068 Rev. A Index-5 115
- 114068 Rev. A Index-7 117
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