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Configuring PPP Services
2-14 114068 Rev. A
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.
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.
- 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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