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Configuring Frame Relay Services
2-6
117376-C Rev. 00
Figure 2-2. Frame Relay Header: 2-Byte Format
Figure 2-2 shows the frame relay header as a 2-byte structure. Frame relay can
also format the header using 3 or 4 bytes, as shown in Figure 2-3
. Note, however,
that you must configure the frame relay interface on the router to use the same
header length as the switched network to which it is connected.
Figure 2-3. Frame Relay Header: 3- and 4-Byte Formats
DLCI (high order) C/R
DE
EA
F
E
C
N
DLCI (low order)
8 7 6 5 4321
B
E
C
N
Flag
Frame
relay
header
Information
(data)
CRC
Flag
EA
FR0002A
DLCI (high order)
DLCI
F
E
C
N
B
E
C
N
D/C EA
DLCI (low order)
or
DL-CORE control
C/R EA
DE EA
DLCI (high order) C/R
DLCI
(low order)
F
E
C
N
DLCI EA
D/C EA
DLCI (low order)
or
DL-CORE control
DE
EA
B
E
C
N
EA
876 54 32 187654321
3-byte format 4-byte format
FR0003A
- 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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