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Configuring Frame Relay Services
2-16 117376-A Rev. A
Traffic Shaping
Traffic shaping relieves bottlenecks in topologies with high-speed connections to
the central site, and low-speed connections at remote sites as in F
igure 2-7 on
page 2-
13. Committed information rate (CIR) enforcement and quality of service
(QoS) are the major components of Bay Networks traffic shaping.
Committed Information Rate
The CIR is the rate at which the network supports data transfer under normal
operations. Its name is descriptive: you have a contract with your carrier, who has
committed to providing a given throughput, here called the committed information
rate. The CIR is measured in bits per second. You configure this value that the
carrier provides per virtual circuit (VC).
CIR of 0
You can contract with a carrier for a CIR of 0, which yields best-effort service at
low cost. The carrier transmits data, but does not commit to providing a specified
throughput. To configure a CIR of 0, set both the Throughput parameter (which is
the CIR) and the Committed Burst (B
c
) parameter to 0, and set the Excess Burst
(B
e
) parameter to a value greater than 0.
Maximum CIR
The maximum CIR should not be greater than the speed of the access line on the
slower end of a VC. In a big pipe/little pipe topology (refer to F
igure 2-7), likely
CIRs at the remote sites would be 32 Kb/s, 56 Kb/s, or 64 Kb/s. If you configure
CIRs for these VCs at the central site, you can use CIR enforcement to prevent the
big pipe from sending traffic that exceeds the PVC CIRs.
CIR Enforcement
CIR enforcement means restricting the speed of outbound traffic to a rate no faster
than the CIR. It is the major component of traffic shaping. You can configure CIR
enforcement to operate over Synchronous, High-Speed Serial Interface (HSSI),
T1, E1, and Integrated Services Digital Network (ISDN) lines, for frame relay
backup, demand, bandwidth-on-demand, and leased lines at the VC level. CIR
enforcement operates on whole frames only. It controls congestion either by
bringing down the VC, or by queuing the traffic, which is also called throttling.
- Configuring Frame Relay 1
- Services 1
- Contents 5
- 117376-A Rev. A 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 16
- How to Get Help 17
- Starting Frame Relay 19
- Chapter 1 19
- Chapter 2 21
- Frame Relay Overview 21
- Introduction 22
- Frame Relay Packets 23
- Management Protocols 24
- 117376-A Rev. A 2-5 25
- DLCMI DLCMI 25
- Frame Processing 26
- Frame Relay Service Records 26
- Frame Relay Access Modes 27
- Direct Access Mode 28
- Hybrid Access Mode 28
- 2-10 117376-A Rev. A 30
- Source Routing 31
- RFC 1490 31
- Address Resolution 31
- Traffic Control 32
- Data Compression 33
- Protocol Prioritization 34
- Congestion Control 34
- Traffic Shaping 36
- Quality of Service 37
- 2-18 117376-A Rev. A 38
- Traffic Shaping Considerations 39
- WCP and CIR Enforcement 40
- Oversubscribing the Interface 41
- 2-22 117376-A Rev. A 42
- Multiline 43
- 2-24 117376-A Rev. A 44
- 2-26 117376-A Rev. A 46
- Chapter 3 47
- Customizing Frame Relay 47
- Using the MIB Object ID 48
- Adding Service Records 48
- Deleting Service Records 49
- Adding PVCs 50
- Deleting PVCs 51
- Selecting a Management Type 52
- Selecting a DLCI Address Type 54
- Selecting Address Length 54
- Monitoring the Connection 55
- Polling Interval 56
- Full Enquiry Interval 56
- Enabling Multicast 57
- 3-12 117376-A Rev. A 58
- Configuring Hybrid Mode 59
- Controlling Congestion 59
- 3-14 117376-A Rev. A 60
- Using Traffic Shaping 61
- Enabling Compression 62
- Removing Multiline Services 64
- Deleting Frame Relay 65
- Appendix A 67
- Site Manager Parameters 67
- 68
- 70
- 70
- A-6 117376-A Rev. A 72
- A-8 117376-A Rev. A 74
- A-10 117376-A Rev. A 76
- A-12 117376-A Rev. A 78
- A-14 117376-A Rev. A 80
- 81
- 81
- A-16 117376-A Rev. A 82
- 84
- A-20 117376-A Rev. A 86
- 88
- Appendix B 89
- Frame Relay Default Settings 89
- B-2 117376-A Rev. A 90
- 117376-A Rev. A Index-1 91
- 117376-A Rev. A Index-3 93
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