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Frame Relay Overview
117376-B Rev. 00 2-19
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.
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
Quality of Service (QoS) is the second major component of Bay Networks 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 an HSSI interface do.
- 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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