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117355-A Rev. A 6-1
Chapter 6
Configuring QOSPF
QOSPF is an extension of OSPF that works in conjunction with RSVP to provide
quality of service for multicast data flows.
For OSPF, the best path is the path with the least metric cost. OSPF does not
consider network resource information when it selects the best path to a
destination.
With QOSPF extensions added, OSPF/MOSPF calculates QoS routes that can
provide the best resources for a multicast flow even though the route may not be
the path with the least metric cost.
In F
igure 6-1, for example, Host 3 (H3) on Network 2 wants to send multicast
data at rate R to a group whose members (H1 and H2) reside on Network 1.
Without QOSPF extensions, MOSPF in Router 3 forwards the data to Router 1
(using the interface with lowest metric cost), whether or not Router 1 has the
resources to transmit data at rate R.
Now assume that Router 2 has the resources to transmit data at rate R and Router
1 does not. With QOSPF enabled on all routers, OSPF forwards the data to Router
2, even though the interface has a higher metric cost.
- Configuring IP 1
- Multicasting and 1
- Multimedia Services 1
- Contents 5
- 117355-A Rev. A 11
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 19
- Chapter 1 21
- Multicast Host Groups 22
- Multicast Extensions to OSPF 24
- Resource Reservation Protocol 24
- Bay Networks Resource Manager 24
- Multicast Table Manager 25
- Chapter 2 27
- Starting IGMP 28
- Starting DVMRP 29
- Starting MOSPF 30
- Starting RSVP 31
- 2-32 117355-A Rev. A 32
- Chapter 3 33
- Customizing IGMP 33
- IGMP Concepts and Terminology 34
- IGMP Host Reports 35
- Host Leave Messages 35
- Customizing Global IGMP 36
- Enabling and Disabling IGMP 37
- Using the BCC 38
- Using Site Manager 39
- Configuring Logging 41
- Enabling Join Acknowledgments 42
- 3-12 117355-A Rev. A 44
- Specifying a Query Rate 46
- Chapter 4 53
- Customizing DVMRP 53
- Neighbor Connections 54
- Figure 4-1. Multicast Routers 55
- Source Route Advertisements 56
- How DVMRP Chooses a Route 57
- Routing Table 58
- Shortest-Path Trees 59
- Customizing DVMRP Globally 60
- Setting the Update Interval 62
- Configuring Tree Pruning 63
- Configuring DVMRP Timers 64
- 4-14 117355-A Rev. A 66
- Specifying a Probe Interval 68
- 4-18 117355-A Rev. A 70
- Logging Debugging Messages 71
- 4-20 117355-A Rev. A 72
- 4-22 117355-A Rev. A 74
- 4-24 117355-A Rev. A 76
- Specifying a Threshold 77
- TTL value from 1 to 254 78
- Configuring a Forwarding Table 79
- 4-28 117355-A Rev. A 80
- Advertising a Default Route 82
- Listening for a Default Route 83
- 4-32 117355-A Rev. A 84
- Configuring a Tunnel 85
- 4-34 117355-A Rev. A 86
- 4-36 117355-A Rev. A 88
- Specifying the Cost 89
- Specifying a TTL 90
- 4-40 117355-A Rev. A 92
- 4-44 117355-A Rev. A 96
- Chapter 5 97
- MOSPF Overview 98
- • All multicasting types 99
- Configuring MOSPF Globally 100
- 5-6 117355-A Rev. A 102
- Enabling Dynamic TTL 104
- Chapter 6 107
- Configuring QOSPF 107
- Figure 6-1. QOSPF Topology 108
- 6-2 117355-A Rev. A 108
- Configuring QOSPF 109
- Enabling Route Pinning 110
- 6-6 117355-A Rev. A 112
- Chapter 7 113
- Configuring RSVP 113
- How RSVP Works 114
- Configuring RSVP 115
- Configuring RSVP Globally 116
- Choosing a Slot 117
- 7-6 117355-A Rev. A 118
- 7-8 117355-A Rev. A 120
- 7-10 117355-A Rev. A 122
- Setting the TTL Override 123
- Setting the Route Delay Value 124
- Chapter 8 127
- Reserving Line Resources 127
- Resource Manager 128
- Supported Media 129
- 8-4 117355-A Rev. A 130
- 8-6 117355-A Rev. A 132
- 8-8 117355-A Rev. A 134
- 8-10 117355-A Rev. A 136
- 8-12 117355-A Rev. A 138
- 8-14 117355-A Rev. A 140
- 8-16 117355-A Rev. A 142
- Appendix A 143
- Site Manager Parameters 143
- DVMRP Parameters 144
- A-4 117355-A Rev. A 146
- 148
- A-8 117355-A Rev. A 150
- 151
- 153
- A-12 117355-A Rev. A 154
- 155
- IGMP Parameters 157
- 158
- IP Configuration Parameters 162
- Resource Manager Parameters 164
- 165
- 166
- 168
- A-28 117355-A Rev. A 170
- 171
- 171
- 171
- 172
- 174
- RSVP Parameters 175
- 176
- A-36 117355-A Rev. A 178
- Appendix B 179
- Multicasting Tools 179
- <source> 181
- <destination> 181
- <group> 181
- <retry_count> 182
- <timeout_count> 182
- 183
- 184
- 184
- 117355-A Rev. A Index-1 185
- 117355-A Rev. A Index-3 187
- 117355-A Rev. A Index-5 189
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