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Frame Relay Overview
117376-A Rev. A 2-17
CIR and Committed Burst Rate and Excess Burst Rate
The committed burst rate (B
c
) defines the number of bits that the router can
transmit over a specified time interval (T
c
) when congestion is occurring. The
excess burst (B
e
) defines the number of extra bits that the router attempts to send
over the T
c
when there is no congestion. Both the B
c
and the B
e
are values that
you configure.
The sum of the B
c
and the B
e
is the maximum amount of traffic that can travel
across the network per T
c
when there is no congestion. If you set the B
e
to a value
greater than zero, the router can send traffic exceeding the CIR. To enforce the
CIR, that is, to limit traffic that the router can send to the amount of the CIR, set
the B
e
to 0.
If you enable congestion control and set the congestion method to throttle, the VC
sends only B
c
bits of data over the time interval T
c
when congestion occurs, even
if you have configured the B
e
to a value greater than 0. It queues the excess data
until congestion abates. If you set the congestion method to
throttle-then-shutdown, the VC first queues traffic when congestion occurs, and
then terminates the VC if throttling does not alleviate congestion.
Quality of Service
QoS is the second major component of traffic shaping. It uses protocol
prioritization with traffic shaping. You configure a prioritization filter on the
default service record for the entire frame relay interface, and CIR enforcement
per VC. QoS operates over Synchronous, HSSI, T1, E1, and ISDN lines, for
backup, demand, and for leased lines. Although the HSSI driver does not support
protocol prioritization, VCs on a HSSI interface do.
Using protocol prioritization with traffic shaping creates two levels of queues. For
traffic shaping the queues are high/normal/low at the VC level. For protocol
prioritization they are interrupt/shaping/high/normal/low at the driver level.
F
igure 2-9 illustrates this concept.
- 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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