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Frame Relay Overview
117376-C Rev. 00
2-37
Random balancing evenly distributes traffic and lets the router use the two lines
efficiently. Because packets travel on different paths, they arrive at the destination
out of sequence, and the upper-layer protocols, for example, IP and Open Systems
Interconnection (OSI), have to resequence the information. Some protocols cannot
tolerate packets arriving out of sequence, so be sure this option is appropriate for
your application.
Address-Based Distribution
Address-based distribution determines the data path for outbound traffic from the
source and destination address in each packet. Any given address pair always uses
the same path.
The router determines whether to route or bridge the packet, and then uses the
corresponding level of address. It uses routing-level addresses for routing traffic,
and the MAC-level addresses for bridging traffic.
Address-based distribution ensures that all outbound traffic travels on the same
path, and that packets arrive in sequence. For protocols that cannot receive packets
out of sequence, use this method. Note, however, that this option does not always
distribute traffic evenly across each line.
Protocol Prioritization and Multiline Incompatibility
You cannot use protocol prioritization with multiline. Protocol prioritization may
change the order of frames arriving over a multiline interface, and frame relay
multiline does not have the ability to correct the sequence.
PVC Pass-Through
The PVC pass-through service allows a single frame relay network access link to
carry both conventional network protocol traffic, and otherwise unroutable frame
relay access device (FRAD) traffic. It works with hybrid mode PVCs only. PVC
pass-through connects two PVCs on separate interfaces so that the router can
transmit traffic it receives on one PVC out the other with no encapsulation
requirements. Figure 2-13
illustrates how PVC pass-through works.
- 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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