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PPP Concepts
117360-A Rev. A 2-15
Multilink and Multiline Compatibility with Previous Versions
A multiline circuit using PPP cannot communicate with a router running a router
software version earlier than 9.0. Pre-9.0x versions use a multiline circuit with
LCP running on only one line. In this situation, you must use uniline PPP.
A multilink circuit can communicate only with a router running Version 10.0 or
later software (because earlier versions do not support the multilink feature).
Attempting to run multilink on a pre-10.0 version results in the multilink circuit
dropping back to multiline.
Configuring Multilink Operation
You configure a PPP multilink circuit by selecting the appropriate value in the
PPP Mode parameter for the intended circuit. This parameter controls whether the
local side of the bundle attempts to negotiate the multilink protocol, and whether
the local circuit operates as the congestion monitor for bandwidth-on-demand.
The congestion monitor locally monitors traffic congestion on the circuit. Only
one side of any connection should be the congestion monitor.
Balancing Traffic Loads
In a configuration with multilink enabled, a sending router divides the outbound
traffic among all the lines in the bundle. The configured external clock speed of
each line determines the proportion of the total traffic each receives. For example,
pairing a 9600-bit/second line with an ISDN-B channel yields a clock-speed ratio
of roughly 1:6.8, assuming same-size packets. That is, for every packet sent on the
slower link, the router can send about seven packets on the faster link.
On the receiving end, multilink resequences packets arriving on different links
using the sequence number from the multilink header. Gaps in the ordering may
occur, however, when packets are corrupted or otherwise lost or when they arrive
after packets with later sequence numbers. To minimize this situation, multilink
buffers out-of-sequence packets in case the preceding sequence-numbered packets
arrive shortly after the later-numbered packets.
- 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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