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Frame Relay Overview
117376-C Rev. 00
2-9
The link access procedure, frame mode (LAPF) layer defines five unnumbered
control frames and three numbered supervisory frames on the communications
link.
LAPF defines the following categories of management frames to support reliable
transfer of multiple numbered frames over SVCs:
• Unnumbered control - Provides connection and disconnection services and
includes set asynchronous balanced mode extended (SABME), disconnect
(DISC), frame reject (FRMR), disconnected mode (DM), and unnumbered
acknowledgment (UA) frames.
• Numbered supervisory - Provides flow control and retransmission information
and includes receiver not ready (RNR), receiver reader (RR), and reject (REJ)
frames.
• Numbered information (I) - A numbered command/response which passes
data across the link using a sliding window protocol. The frames are
numbered sequentially and carry an acknowledgment of the highest numbered
frame received by the sending peer. The maximum number of frames
outstanding is configurable. These frames can only be sent after setup of
multiple frame communications on the link. A flag within the frame
differentiates a command from its response.
• Exchange identification (XID) - An unnumbered command/response used to
allow peers to exchange identification information.
LAPF Operational States
LAPF has three main operational states:
• TEI-assigned - This is the base interface state. When the LAPF circuit is first
established, this is its state. No timers are running and only unnumbered
frames are supported across the link.
• Active - This state indicates that multiple frame support is up and running on
the interface. Numbered information frames can travel across the link.
• Timer recovery - This state indicates that a timer has expired and the peer is
attempting to recover either through retransmission (T200 timeout) or by
initiating an idle time handshake (T203 timeout).
Once multiple frame support is operating on the channel, numbered information
frames are exchanged to transfer data and acknowledge earlier transfers.
- 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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