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Configuring IP Multicasting and Multimedia Services
4-4 117355-A Rev. A
At startup, a DVMRP multicasting router
1. Initializes its routing table with information on all of its local networks
2. Learns the existence of its neighbors by sending a probe for all routes on each
of its multicast interfaces (both physical circuits and tunnels)
3. Receives reports from its neighbors containing the routing information
(including route costs)
In Figure 4-
1, for example, Router D becomes active and issues routing probes on
four multicasting interfaces. Router D receives reports from its multicasting
neighbors, Routers B, C, and E.
Source Route Advertisements
A source network is any network containing hosts that have the capability to issue
multicast datagrams. DVMRP advertises shortest-path routes to multicasting
source networks. In this respect, DVMRP is the opposite of RIP, which advertises
routes to destination networks.
Periodically, each multicasting router issues full or partial routing information on
each DVMRP circuit, using DVMRP report messages. This routing information
represents the sending router’s cost to reach the specified source network. (The
cost is the sum of the hop metrics along the shortest path to the given source
network.)
Upon receiving a DVMRP report from another router, DVMRP reexamines its
routing table to determine if the shortest path information needs updating.
Specifically, DVMRP looks in the routing table for an entry describing a route to
the same source network. If one exists, DVMRP compares the cost of the two
routes and stores the route with the lower cost in its routing table.
A router will not send route reports on an interface until it knows (by means of
received probes or reports) that it has a neighboring multicast router on that
interface. It will continue to send probes periodically on an interface.
- 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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