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Frame Relay Overview
117376-B Rev. 00 2-25
Using Traffic Shaping Effectively
You can use traffic shaping at one or both ends of a link, but you must use
compression at both ends of a link. It makes sense to use traffic shaping at a
central site, where you have a T1 line that sends data to remote sites with 64 KB
line rates, and the goal is to control the flow of traffic and avoid flooding the
remote sites. But if the CIR is equal to the line rate, which could well be the case
at the remote site with 64 KB line rates, there is no need to use traffic shaping.
Using Compression Effectively
You can use compression effectively in the case of the 64 KB site which does not
use traffic shaping. You can also compensate for the throughput cost associated
with using compression and traffic shaping at the central site by taking into
account characteristics of compression and traffic shaping, and fine-tuning traffic
shaping parameters.
• When you configure traffic shaping, take into account the compression ratio
you want to achieve.
• If you set the B
e
equal to the B
c
, the router doubles the amount of traffic it
attempts to send and, when you enable compression, compresses that amount
of traffic, because WCP compresses data at the rate it receives it.
• If you also set the Congestion Method to throttle, the router will queue traffic
if congestion occurs, and thus prevent exceeding the CIR.
• Congestion may occur if compression histories are not in sync, and WCP has
to resend packets. If WCP retransmits many packets, it may exceed the CIR.
Oversubscribing the Interface
The CIRs that you configure are based on an average peak rate for the VCs on the
network. If all VCs with traffic shaping try to send data simultaneously, they may
exceed the capacity of the interface. If you oversubscribe the interface, traffic
shaping will still enforce the CIR, but there may be additional latency for reserved
flows. VCs without traffic shaping will send data after traffic shaped VCs.
Queue Limits and Data Clipping
Bay Networks routers maintain buffers for each traffic shaped VC. Each buffer
can hold one frame that the router cannot send because of congestion. The router
divides the number of buffers on the interface. Some key facts specific to buffers
are:
- Configuring 1
- Frame Relay Services 1
- Contents 5
- Incoming 6
- 117376-B Rev. 00 11
- About This Guide 15
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 18
- How to Get Help 19
- Chapter 1 21
- Starting Frame Relay 21
- Configuring PVCs and SVCs 22
- Configuring an SVC 23
- Configuring IP Adjacent Hosts 24
- Configuring IPX Adjacent Hosts 25
- 1-6 117376-B Rev. 00 26
- Chapter 2 27
- Frame Relay Overview 27
- Introduction 28
- Permanent Virtual Circuits 29
- Switched Virtual Circuits 29
- PVC and SVC Comparison 30
- Frame Relay Packets 30
- 117376-B Rev. 00 2-5 31
- Management Protocols 32
- Frame Processing 34
- Frame Relay Service Records 34
- Frame Relay Access Modes 35
- Direct Access Mode 36
- Hybrid Access Mode 36
- 2-12 117376-B Rev. 00 38
- Source Routing 39
- RFC 1490 39
- Address Resolution for PVCs 39
- Address Resolution for SVCs 40
- Traffic Control 40
- Data Compression 41
- Data Encryption 42
- Protocol Prioritization 42
- Congestion Control 42
- Traffic Shaping 44
- Quality of Service 45
- 2-20 117376-B Rev. 00 46
- Traffic Shaping for SVCs 47
- 2-22 117376-B Rev. 00 48
- Traffic Shaping Considerations 49
- WCP and CIR Enforcement 50
- Oversubscribing the Interface 51
- 2-26 117376-B Rev. 00 52
- X.213 Priority for SVCs 53
- Inactivity Timing for SVCs 53
- 2-28 117376-B Rev. 00 54
- Multiline for PVCs 55
- 2-30 117376-B Rev. 00 56
- PVC Pass Through 57
- Frame Relay Dial Services 58
- 2-34 117376-B Rev. 00 60
- Chapter 3 61
- Customizing Frame Relay 61
- Selecting a Management Type 62
- Selecting a DLCI Address Type 63
- Selecting Address Length 64
- Monitoring the Connection 65
- 3-6 117376-B Rev. 00 66
- Customizing PVCs 67
- To delete service records: 68
- Enabling Multicast 70
- Configuring PVC Pass Through 72
- 3-14 117376-B Rev. 00 74
- To enable congestion control: 75
- 3-16 117376-B Rev. 00 76
- Enabling Compression for PVCs 77
- 3-18 117376-B Rev. 00 78
- Removing Multiline Services 79
- Customizing SVCs 80
- Adding SVCs 81
- 3-22 117376-B Rev. 00 82
- Disabling SVCs 83
- Disconnecting SVCs 84
- To edit LAPF parameters: 85
- To edit Signaling parameters: 86
- To set X.213 priority values: 88
- 3-30 117376-B Rev. 00 90
- To enable traffic shaping 91
- Enabling Compression for SVCs 92
- To disable compression: 93
- Deleting Frame Relay 95
- Appendix A 97
- A-2 117376-B Rev. 00 98
- 100
- Site Manager Parameters 101
- 102
- 102
- A-8 117376-B Rev. 00 104
- A-10 117376-B Rev. 00 106
- SVC LAPF Parameters 107
- A-12 117376-B Rev. 00 108
- 109
- 110
- A-16 117376-B Rev. 00 112
- SVC Signaling Parameters 113
- A-18 117376-B Rev. 00 114
- A-20 117376-B Rev. 00 116
- Parameters for PVCs 118
- A-24 117376-B Rev. 00 120
- PVC Service Record Parameters 122
- 123
- 123
- A-28 117376-B Rev. 00 124
- 125
- A-30 117376-B Rev. 00 126
- A-32 117376-B Rev. 00 128
- SVC Service Record Parameters 130
- 133
- 134
- SVC Options Parameters 136
- A-46 117376-B Rev. 00 142
- A-48 117376-B Rev. 00 144
- A-50 117376-B Rev. 00 146
- A-52 117376-B Rev. 00 148
- Appendix B 151
- B-2 117376-B Rev. 00 152
- Table B-1. RIP Parameters 152
- B-4 117376-B Rev. 00 154
- B-6 117376-B Rev. 00 156
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