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Frame Relay Overview
117376-B Rev. 00 2-17
In the frame relay packet header, there are two bits that the network sets to alert
nodes of network congestion. These bits, as defined by the frame relay
specification, are the FECN (forward explicit congestion notation) bit and the
BECN (backward explicit congestion notation) bit.
If the network detects congestion, it alerts the router in the same direction as the
received frame by changing the frame’s FECN bit from 0 to 1. For nodes in the
opposite direction of the received frame, it changes the frame’s BECN bit from 0
to 1 (F
igure 2-8).
Figure 2-8. Detecting and Controlling Network Congestion
If you enable the congestion control feature, you can specify the number of
FECN/BECN bits the router receives in a given time period before it stops
transmitting frames. While frames are going across the network, the frame relay
interface checks received packets for FECN and BECN bits set to 1. If the
interface receives the specified number of bits during the designated time period,
frame relay drops all traffic destined for the PVC where there is congestion. When
the interface no longer receives these congestion notifications, the router resumes
transmission.
For example, suppose you set the congestion timer to 0.5 seconds and the
congestion count to 3. In this case, if an interface receives 3 FECNs or BECNs
within 0.5 seconds, the node stops sending frames (although it continues to
receive frames for this PVC). If the interface receives no FECNs or BECNs during
the next 0.5 seconds, the router resumes transmission. For instructions on
configuring the congestion parameters, see Cha
pter 3, “Customizing Frame
Relay,”
Congestion
direction
BECN
FECN
Frame relay
network
node
Frame relay
network
node
Frame relay
network
node
FR0010A
- Configuring 1
- Frame Relay Services 1
- Contents 5
- Incoming 6
- 117376-B Rev. 00 11
- 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 22
- Configuring an SVC 23
- Configuring IP Adjacent Hosts 24
- Configuring IPX Adjacent Hosts 25
- 1-6 117376-B Rev. 00 26
- Chapter 2 27
- Frame Relay Overview 27
- Introduction 28
- Permanent Virtual Circuits 29
- Switched Virtual Circuits 29
- PVC and SVC Comparison 30
- Frame Relay Packets 30
- 117376-B Rev. 00 2-5 31
- Management Protocols 32
- Frame Processing 34
- Frame Relay Service Records 34
- Frame Relay Access Modes 35
- Direct Access Mode 36
- Hybrid Access Mode 36
- 2-12 117376-B Rev. 00 38
- Source Routing 39
- RFC 1490 39
- Address Resolution for PVCs 39
- Address Resolution for SVCs 40
- Traffic Control 40
- Data Compression 41
- Data Encryption 42
- Protocol Prioritization 42
- Congestion Control 42
- Traffic Shaping 44
- Quality of Service 45
- 2-20 117376-B Rev. 00 46
- Traffic Shaping for SVCs 47
- 2-22 117376-B Rev. 00 48
- Traffic Shaping Considerations 49
- WCP and CIR Enforcement 50
- Oversubscribing the Interface 51
- 2-26 117376-B Rev. 00 52
- X.213 Priority for SVCs 53
- Inactivity Timing for SVCs 53
- 2-28 117376-B Rev. 00 54
- Multiline for PVCs 55
- 2-30 117376-B Rev. 00 56
- PVC Pass Through 57
- Frame Relay Dial Services 58
- 2-34 117376-B Rev. 00 60
- Chapter 3 61
- Customizing Frame Relay 61
- Selecting a Management Type 62
- Selecting a DLCI Address Type 63
- Selecting Address Length 64
- Monitoring the Connection 65
- 3-6 117376-B Rev. 00 66
- Customizing PVCs 67
- To delete service records: 68
- Enabling Multicast 70
- Configuring PVC Pass Through 72
- 3-14 117376-B Rev. 00 74
- To enable congestion control: 75
- 3-16 117376-B Rev. 00 76
- Enabling Compression for PVCs 77
- 3-18 117376-B Rev. 00 78
- Removing Multiline Services 79
- Customizing SVCs 80
- Adding SVCs 81
- 3-22 117376-B Rev. 00 82
- Disabling SVCs 83
- Disconnecting SVCs 84
- To edit LAPF parameters: 85
- To edit Signaling parameters: 86
- To set X.213 priority values: 88
- 3-30 117376-B Rev. 00 90
- To enable traffic shaping 91
- Enabling Compression for SVCs 92
- To disable compression: 93
- Deleting Frame Relay 95
- Appendix A 97
- A-2 117376-B Rev. 00 98
- 100
- Site Manager Parameters 101
- 102
- 102
- A-8 117376-B Rev. 00 104
- A-10 117376-B Rev. 00 106
- SVC LAPF Parameters 107
- A-12 117376-B Rev. 00 108
- 109
- 110
- A-16 117376-B Rev. 00 112
- SVC Signaling Parameters 113
- A-18 117376-B Rev. 00 114
- A-20 117376-B Rev. 00 116
- Parameters for PVCs 118
- A-24 117376-B Rev. 00 120
- PVC Service Record Parameters 122
- 123
- 123
- A-28 117376-B Rev. 00 124
- 125
- A-30 117376-B Rev. 00 126
- A-32 117376-B Rev. 00 128
- SVC Service Record Parameters 130
- 133
- 134
- SVC Options Parameters 136
- A-46 117376-B Rev. 00 142
- A-48 117376-B Rev. 00 144
- A-50 117376-B Rev. 00 146
- A-52 117376-B Rev. 00 148
- Appendix B 151
- B-2 117376-B Rev. 00 152
- Table B-1. RIP Parameters 152
- B-4 117376-B Rev. 00 154
- B-6 117376-B Rev. 00 156
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