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Configuring Frame Relay Services
2-24 117376-B Rev. 00
• If, however, you are sending frames that exceed the size of the B
c
, data travels
very slowly because the router must use multiple time periods to
accommodate the packet size and avoid exceeding the CIR. If setting the B
c
to
1/4 of the CIR yields a value lower than packet size, set the B
c
to 1/3 or even
1/2 of the CIR.
For example, a typical TFTP frame is 548 bytes. If the CIR is 16,000 bits, the
B
c
configured according to the 1/4 guideline would be 4,000 bits, or 500
bytes, which is not big enough to accommodate a TFTP frame. If you set the
B
c
to 16,000/2, or 1/2 CIR, the result is 8,000 bits, or a packet size of 1,000
bytes, which works, but may result in excessive queuing because the T
c
is 1/2
second. If you set the B
c
to 16,000/3 or 1/3 of CIR, the result is a B
c
of 5,333
bits or 666 bytes, much closer to the 548 TFTP frame size.
• If you cannot predict the typical frame size, monitor frame relay shaping
statistics for numbers of large frames and dropped frames. If either of these
numbers is increasing constantly or dramatically, adjust the B
c
to a higher
value in small increments.
WCP and CIR Enforcement
Consider the following when you are determining the best configuration for your
network:
• Data compression maximizes throughput and increases reliability.
• Traffic shaping increases reliability, controls congestion, and prioritizes
traffic.
• Compression and traffic shaping together maximize reliability, but at the
expense of throughput.
Using Traffic Shaping With Data Compression
Traffic shaping occurs at the VC level; compression, at the driver level. Shaping
therefore occurs before compression, which compromises effective compression
because only the precompressed traffic is shaped: the compressed traffic is not
shaped. WCP compresses data at the rate it receives it, which with traffic shaping
is the CIR. It is therefore unrealistic to expect a high compression throughput for
data that originates from a site that also uses traffic shaping.
- 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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