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Frame Relay Overview
117376-A Rev. A 2-21
• 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 (default number of buffers is 200
per interface) by the number of traffic-shaped VCs, giving each VC the same
number of buffers. If you have 10 traffic shaped VCs per interface, each VC has 20
buffers. If you enable protocol prioritization, the default number of buffers is 30
for high priority traffic, 200 for normal, and 30 for low.
You can use the Technician Interface to increase the total number of buffers for the
interface, and you can also redistribute buffers among the VCs and among priority
queues. The attributes that you customize at the interface level are
wfFrDlcmiShapingHiQueueLimit
wfFrDlcmiShapingNormalQueueLimit
wfFrDlcmiShapingLoQueueLimit
At the VC level the attributes are
wfFrCircuitShapedHiQueueLimit.
wfFrCircuitShapedNormalQueueLimit
wfFrCircuitShapedLoQueueLimit
- 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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