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Configuring Frame Relay Services
2-24
117376-C Rev. 00
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 attribute or
parameter (which is the CIR) and the Committed Burst (B
c
) attribute or parameter
to 0, and set the Excess Burst (B
e
) attribute or parameter to a value greater than 0.
For more information on burst rates, see “Committed Burst Rate and Excess Burst
Rate” on page 2-24.
Maximum CIR
The maximum CIR should not be greater than the speed of the access line on the
slower end of a virtual circuit. In a big pipe/little pipe topology (illustrated in
Figure 2-8
), likely CIRs at the remote sites would be 32 Kb/s, 56 Kb/s, or 64 Kb/s.
If you configure CIRs for these virtual circuits at the central site, you can use CIR
enforcement (described in the next topic) 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 virtual circuit
level. CIR enforcement operates on whole frames only. It controls congestion
either by bringing down the virtual circuit, 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.
- Configuring 1
- Frame Relay Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117376-C Rev. 00 10
- 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 26
- Configuring an SVC 27
- Chapter 2 31
- Frame Relay Overview 31
- Introduction to Frame Relay 32
- Permanent Virtual Circuits 33
- Switched Virtual Circuits 33
- PVC and SVC Comparison 34
- Frame Relay Packets 35
- . Note, however 36
- Management Protocols 37
- BYS0037A 38
- LAPF Operational States 39
- SVC Signaling 41
- Call Setup 42
- Message Processing 43
- Frame Relay Service Records 44
- Frame Relay Access Modes 45
- Direct Access Mode 46
- Hybrid Access Mode 46
- Source Routing 48
- RFC 1490 48
- Address Resolution for PVCs 48
- Address Resolution for SVCs 49
- Traffic Control 50
- Data Compression 51
- Data Encryption 51
- Protocol Prioritization 51
- Traffic Shaping 53
- Quality of Service 55
- Traffic Shaping for SVCs 57
- Incoming 59
- Outgoing 59
- CIR Configuration Guidelines 60
- WCP and CIR Enforcement 60
- Oversubscribing the Interface 62
- X.213 Priority for SVCs 64
- Inactivity Timing for SVCs 64
- Multiline for PVCs 65
- PVC Pass-Through 67
- Frame Relay Dial Services 68
- Caution: 71
- Selecting a Management Type 72
- Selecting a DLCI Address Type 74
- Selecting Address Length 74
- Monitoring the Connection 76
- Polling Interval 77
- Full Enquiry Interval 77
- Customizing PVCs 81
- To delete PVCs: 87
- To move PVCs: 87
- Enabling Multicast 88
- Configuring PVC Pass-Through 90
- <integer> 100
- Enabling Compression for PVCs 102
- Using the BCC 103
- Using Site Manager 103
- Customizing SVCs 105
- For example: 107
- To delete service records: 107
- Call Screening and Blocking 108
- Disabling SVCs 112
- Disconnecting Active SVCs 114
- Setup Timer 121
- <value> 126
- (continued) 128
- Congestion Control 129
- Congestion Timer 130
- Congestion Counter 130
- Congestion Method 131
- To enable congestion control 134
- To enable traffic shaping 139
- To disable compression: 141
- To set X.213 priority value 143
- Deleting Frame Relay 144
- Customizing Frame Relay 145
- Appendix A 147
- Site Manager Parameters 147
- Figure A-2 148
- SVC LAPF Parameters 157
- SVC Signaling Parameters 163
- Parameters for PVCs 168
- PVC Service Record Parameters 172
- SVC Service Record Parameters 180
- SVC Options Parameters 186
- WHERE DOES THIS PARAMETER GO? 200
- Appendix B 201
- Table B-1. RIP Parameters 202
- Appendix C 209
- Monitoring Frame Relay Using 209
- BCC show Commands 209
- Commands for Frame Relay 210
- <option> 212
- <dlci> 215
- <name> 215
- ] [-service 216
- <multiline_name> 223
- <name> 228
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