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Configuring PPP Services
2-16 117360-A Rev. A
Using Multilink Fragmentation
By default, PPP multilink allows packet fragmentation. With fragmentation
enabled, PPP splits large datagrams into smaller packets and sends these packets
across links in a multilink bundle. Enabling fragmentation means that PPP can
split packets when necessary for better performance. PPP does not arbitrarily split
all the packets it transmits. Fragmentation improves the distribution of data across
multilink lines and uses buffer resources more efficiently, thereby improving the
flow of data over multilink circuits. By default, multilink fragmentation is
enabled. Bay Networks routers comply with RFC 1717, which defines PPP
multilink.
Without multilink fragmentation, when PPP sends packets over a multilink
bundle, it sends one packet over each line in sequence in a round-robin fashion. To
optimize performance, PPP does attempt to send fewer packets on the slower
lines. However, some packets with higher sequence numbers sent over faster lines
could be received earlier than packets with lower sequence numbers sent over
slower lines. Since PPP maintains the sequence of received packets, the receiving
peer must store the out-of-sequence packets until the delayed packet arrives, and
this can result in slower network performance. If the number of packets needing to
be resequenced is greater than the available allowed buffer space, some packets
could be considered late and discarded.
When you enable fragmentation, you can specify the minimum-size packet that
you want PPP to consider fragmenting. (The default minimum size is 256 bytes.)
Even with fragmentation enabled, PPP generally avoids splitting packets unless
network performance considerations warrant it.
When necessary, PPP splits packets into fragments and then sends the fragments
over the lines in the bundle, reassembling them on the receiving peer into the
proper sequence. PPP discards all fragments of an incomplete reassembly. The
number of fragments is equal to or less than the number of lines available. For
bundles containing lines of different speeds, PPP tries to send the smaller
fragments over the slower lines. This mechanism ensures a more even flow of
data.
- 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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