Avaya Configuring APPN Services Bedienungsanleitung Seite 39
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Advanced Peer-to-Peer Networking Overview
114049 Rev. A 1-17
End-to-End Error Recovery
End-to-end error recovery enables APPN NN endpoints to recovery lost traffic.
HPR endpoint NNs always perform end-to-end recovery. However, Site Manager
allows you to specify base APPN link-level error recovery, where error recovery is
done on every link, consuming more network resources.
When link level recovery is turned off and an error is detected, the packet is
discarded, resulting in a gap in the stream of bytes over the RTP connection.
When the RTP connection endpoint NN detects the gap in the incoming byte
stream, it informs the sender to begin retransmitting from the first byte after this
point in the stream. RTP supports selective retransmission of parts of the byte
stream, when the RTP endpoint requests a range of bytes for retransmission.
End-to-End Flow and Congestion Control
Operating at the NN sending and receiving endpoints of an RTP connection, HPR
uses a preventative mechanism called adaptive rate-based (ARB) congestion
control. ARB monitors, predicts, and regulates the flow of traffic into the network
as conditions change. When the network approaches congestion (increased delay,
decreased throughput), ARB reduces the input traffic rate so that a recipient
endpoint NN can adequately handle the traffic.
With multiple RTP connections over a single link, the ARB function regulates the
flow of traffic in all connections. This provides fairness to all connections.
With multiple SNA sessions over a single RTP connection, HPR’s adaptive
session-level pacing maintains fairness among the sessions. This prevents one
session from unfairly consuming network resources, compared to other sessions
on the RTP connection.
Note: High-speed links generally have low error rates. Therefore, link-level
recovery may not be necessary in the higher speed HPR configurations.
- Configuring APPN 1
- Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- 114049 Rev. A 10
- About This Guide 13
- Conventions 14
- Acronyms 15
- World Wide Web 19
- Customer Service FTP 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- CP-CP, LU-LU 27
- 1-8 114049 Rev. A 30
- Interfaces 31
- Link Stations 31
- Connection Networks 32
- 114049 Rev. A 1-11 33
- Intermediate Session Routing 34
- Adaptive Pacing 35
- High Performance Routing 36
- 114049 Rev. A 1-15 37
- 1-16 114049 Rev. A 38
- 114049 Rev. A 1-17 39
- Automatic Network Routing 40
- APPN Services 41
- Directory Services 42
- Configuration Services 43
- Management Services 43
- 1-22 114049 Rev. A 44
- Chapter 2 45
- Enabling APPN Services 45
- 2-2 114049 Rev. A 46
- 2. Click on OK 46
- 114049 Rev. A 2-3 47
- 2-4 114049 Rev. A 48
- 2-6 114049 Rev. A 50
- 7. Click on OK 50
- 114049 Rev. A 2-7 51
- 2-8 114049 Rev. A 52
- Interface window 54
- 114049 Rev. A 2-11 55
- 2-12 114049 Rev. A 56
- 58
- 59
- 60
- 60
- 114049 Rev. A 2-17 61
- 2-18 114049 Rev. A 62
- 114049 Rev. A 2-19 63
- Chapter 3 65
- Accessing APPN Parameters 66
- 114049 Rev. A 3-3 67
- 3-6 114049 Rev. A 70
- 3-8 114049 Rev. A 72
- 3-10 114049 Rev. A 74
- 3-16 114049 Rev. A 80
- 83
- 3-22 114049 Rev. A 86
- 3-24 114049 Rev. A 88
- Figure 3-7. APPN Port Window 88
- 3-26 114049 Rev. A 90
- 3-28 114049 Rev. A 92
- 3-30 114049 Rev. A 94
- 3-34 114049 Rev. A 98
- 114049 Rev. A 3-35 99
- 100
- Editing APPN Parameters 101
- Configuring APPN Services 102
- 3-38 114049 Rev. A 102
- 3-40 114049 Rev. A 104
- Adding Adjacent Link Stations 107
- 3-44 114049 Rev. A 108
- 3-46 114049 Rev. A 110
- 3-48 114049 Rev. A 112
- 1. Click on Advanced 113
- 3-50 114049 Rev. A 114
- 3-54 114049 Rev. A 118
- 3-56 114049 Rev. A 120
- 114049 Rev. A 3-59 123
- 3-60 114049 Rev. A 124
- 114049 Rev. A 3-61 125
- 114049 Rev. A 3-63 127
- 3-64 114049 Rev. A 128
- 3-66 114049 Rev. A 130
- 3-68 114049 Rev. A 132
- 3-70 114049 Rev. A 134
- 114049 Rev. A 3-71 135
- 3-72 114049 Rev. A 136
- 3-74 114049 Rev. A 138
- 3. Click on OK 138
- Appendix A 139
- A-2 114049 Rev. A 140
- (continued) 141
- A-4 114049 Rev. A 142
- Appendix B 143
- APPN Default Settings 143
- B-2 114049 Rev. A 144
- B-4 114049 Rev. A 146
- B-6 114049 Rev. A 148
- 114049 Rev. A Index-1 149
- 114049 Rev. A Index-3 151
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