Avaya Configuring Frame Relay Services Uživatelský manuál Strana 39
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Frame Relay Overview
117376-A Rev. A 2-19
All traffic that goes to a traffic-shaped VC (VC1 or VC2) is queued as high,
normal, or low priority at the VC level, and then it travels, by priority order, to a
shaping queue within the driver. Normal VC traffic is queued as high, normal, or
low priority at the driver level. At the driver level:
• Interrupt priority traffic, DLCMI/LMI requests (the LMI box in F
igure 2-9),
has the highest priority. You cannot change that.
• Shaped priority traffic (shaping box in F
igure 2-9) has the second highest
priority.
• Normal VC traffic (not shaped) has lower priority than shaped traffic. You can
still prioritize normal VC traffic as high, normal, or low.
Queuing and prioritization only matter when the traffic rate exceeds the VC line
rate or the CIR. If the total of all traffic is below the CIR, the router just transmits
it.
You cannot prioritize between VCs on which you have enabled traffic shaping.
The router schedules traffic among them in a round-robin manner.
For information about configuring filters for protocol prioritization, see
Configuring Traffic Filters and Protocol Prioritization.
Traffic Shaping Considerations
Traffic shaping is best used at central offices to prevent the “big pipe” from
sending too much data too quickly to remote sites with “little pipes.” Let this
principle guide your decisions about how to use traffic shaping on your network.
CIR Configuration Guidelines
In general, the value you assign to the B
c
should equal 1/4 of the CIR to avoid
excessive queuing and dropped packets. If, however, you are sending frames that
exceed the size of the B
c
, data travels very slowly because the router must use
multiple time periods to accommodate the packet size and avoid exceeding the
CIR. If setting the B
c
to 1/4 of the CIR yields a value lower than packet size, set
the B
c
to 1/3 or even 1/2 of the CIR.
- 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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