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Configuring Frame Relay Services
2-14 117376-A Rev. A
To use data compression with frame relay, the Compression Control parameter
must be set to Enable, the default value (see Cha
pter 3 or Appendix A for
information about how to access this parameter). You must also select WCP from
the protocols menu.
For a complete discussion of data compression, see Configuring Data
Compression Services.
Protocol Prioritization
You can set priorities for the traffic sent across a synchronous line interface using
a process called protocol prioritization. The ability to prioritize traffic is important
for an application that is time-sensitive and that requires a fast response.
For example, a user at router A participating in a Telnet session with router B
requires a more immediate response than does a user at router A performing a file
transfer with router B.
When you select frame relay on a circuit, the router enables protocol prioritization
automatically. It does so because the DLCMI packets must have a higher priority
than any other packets you are sending across the network.
For more information about protocol prioritization, see Configuring Traffic Filters
and Protocol Prioritization.
Congestion Control
Network congestion can degrade network performance. Congestion occurs when
a node receives more frames than it can process, or sends more frames than the
transmission line can handle. The frame relay network informs the nodes of
congestion, so that they can reduce the amount of traffic across the network.
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).
- Configuring Frame Relay 1
- Services 1
- Contents 5
- 117376-A Rev. A 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- Bay Networks Customer Service 16
- How to Get Help 17
- Starting Frame Relay 19
- Chapter 1 19
- Chapter 2 21
- Frame Relay Overview 21
- Introduction 22
- Frame Relay Packets 23
- Management Protocols 24
- 117376-A Rev. A 2-5 25
- DLCMI DLCMI 25
- Frame Processing 26
- Frame Relay Service Records 26
- Frame Relay Access Modes 27
- Direct Access Mode 28
- Hybrid Access Mode 28
- 2-10 117376-A Rev. A 30
- Source Routing 31
- RFC 1490 31
- Address Resolution 31
- Traffic Control 32
- Data Compression 33
- Protocol Prioritization 34
- Congestion Control 34
- Traffic Shaping 36
- Quality of Service 37
- 2-18 117376-A Rev. A 38
- Traffic Shaping Considerations 39
- WCP and CIR Enforcement 40
- Oversubscribing the Interface 41
- 2-22 117376-A Rev. A 42
- Multiline 43
- 2-24 117376-A Rev. A 44
- 2-26 117376-A Rev. A 46
- Chapter 3 47
- Customizing Frame Relay 47
- Using the MIB Object ID 48
- Adding Service Records 48
- Deleting Service Records 49
- Adding PVCs 50
- Deleting PVCs 51
- Selecting a Management Type 52
- Selecting a DLCI Address Type 54
- Selecting Address Length 54
- Monitoring the Connection 55
- Polling Interval 56
- Full Enquiry Interval 56
- Enabling Multicast 57
- 3-12 117376-A Rev. A 58
- Configuring Hybrid Mode 59
- Controlling Congestion 59
- 3-14 117376-A Rev. A 60
- Using Traffic Shaping 61
- Enabling Compression 62
- Removing Multiline Services 64
- Deleting Frame Relay 65
- Appendix A 67
- Site Manager Parameters 67
- 68
- 70
- 70
- A-6 117376-A Rev. A 72
- A-8 117376-A Rev. A 74
- A-10 117376-A Rev. A 76
- A-12 117376-A Rev. A 78
- A-14 117376-A Rev. A 80
- 81
- 81
- A-16 117376-A Rev. A 82
- 84
- A-20 117376-A Rev. A 86
- 88
- Appendix B 89
- Frame Relay Default Settings 89
- B-2 117376-A Rev. A 90
- 117376-A Rev. A Index-1 91
- 117376-A Rev. A Index-3 93
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