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Frame Relay Overview
117376-C Rev. 00
2-27
All traffic that goes to a traffic-shaped VC (VC1 or VC2) is queued as high,
normal, or low priority at the VC level, and then it travels, by priority order, to a
shaping queue within the driver. Normal VC traffic is queued as high, normal, or
low priority at the driver level. At the driver level:
• Interrupt priority traffic, DLCMI/LMI requests (the LMI box in Figure 2-10
),
has the highest priority. You cannot change this.
• Shaped priority traffic (the Shaping box in Figure 2-10
) has the second
highest priority.
• Normal VC traffic (not shaped) has lower priority than shaped traffic. You can
still prioritize normal VC traffic as high, normal, or low.
Queuing and prioritization only matter when the traffic rate exceeds the VC line
rate or the CIR. If the total of all traffic is below the CIR, the router just transmits
it.
You cannot prioritize between VCs on which you have enabled traffic shaping.
The router schedules traffic among them in a round-robin manner.
For information about configuring filters for protocol prioritization, see
Configuring Traffic Filters and Protocol Prioritization.
Traffic Shaping for SVCs
Traffic shaping for SVCs works according to the descriptions in the previous
topics, except that SVCs derive the committed burst, excess burst, and throughput
values from a combination of the traffic shaping attributes and parameters that you
configure, and values that the frame relay network imposes. The network values
are called link layer core (LL Core) values,
Requesting Quality of Service for SVCs
When you configure traffic shaping for an SVC, you have several alternatives to
achieve the QoS that will best serve your network:
• You can set the SVC Traffic Shaping Disable attribute or parameter to Enable
without providing values for the traffic shaping attribute or parameters. The
SVCs you configure in this way use LL Core values that the network
provides.
- 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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