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Configuring IP Multicasting and Multimedia Services
4-2
117355-C Rev 00
DVMRP Concepts and Terminology
DVMRP is a multicasting protocol that provides a mechanism for routers to
propagate multicast datagrams in a manner that minimizes the number of excess
copies sent to any particular network.
This section covers the following topics:
Neighbor Connections
In a DVMRP environment, neighbors are multicasting routers that are connected
directly or through a tunnel:
• Directly connected neighbors are routers that have an interface to the same
network.
• Tunnel-connected neighbors are multicast routers that communicate through a
unicast network, exchanging DVRMP messages that are encapsulated in IP
datagrams.
In Figure 4-1
, for example, multicasting router A has two neighbors, router B and
router C. Router A and router B are connected directly -- they both have interfaces
to net 6. Router A and router C communicate through a tunnel that includes a
unicast router.
Topic Page
Neighbor Connections
4-2
Source Route Advertisements 4-4
How DVMRP Chooses a Route 4-5
Routing Table 4-6
Shortest-Path Trees 4-7
Tree Pruning 4-7
- Configuring IP 1
- Multicasting and 1
- Multimedia Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117355-C Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- How to Get Help 19
- Chapter 1 21
- Multicast Host Groups 22
- Multicast Addresses 23
- Resource Reservation Protocol 24
- Bay Networks Resource Manager 24
- IGMP Relay 25
- Multicast Table Manager 25
- Chapter 2 27
- Starting IGMP 28
- Starting DVMRP 29
- Starting MOSPF 30
- Starting RSVP 31
- Chapter 3 33
- IGMP Concepts and Terminology 34
- IGMP Host Reports 35
- Host Leave Messages 35
- Customizing Global IGMP 36
- Enabling and Disabling IGMP 37
- Configuring Logging 42
- Enabling Join Acknowledgments 43
- Accepting a Nonlocal Report 45
- Specifying a Query Rate 48
- Configuring IGMP Policies 56
- Chapter 4 59
- Neighbor Connections 60
- Figure 4-1. Multicast Routers 61
- Source Route Advertisements 62
- How DVMRP Chooses a Route 63
- Routing Table 64
- Shortest-Path Trees 65
- Tree Pruning 65
- Customizing DVMRP Globally 66
- Setting the Update Interval 68
- Setting the Leaf Timer 77
- Specifying a Probe Interval 79
- Logging Debugging Messages 85
- Listening for a Default Route 100
- Using the BCC 101
- Using Site Manager 102
- Configuring a Tunnel 104
- Specifying the Cost 110
- Specifying a Threshold 111
- Advertising a Default Route 114
- Configuring DVMRP Policies 120
- Customizing DVMRP 121
- (continued) 122
- Configuring an Accept Policy 124
- Table 4-5 127
- Chapter 5 131
- MOSPF Overview 132
- • All multicasting types 133
- Configuring MOSPF Globally 134
- Enabling Dynamic TTL 139
- Chapter 6 143
- Configuring QOSPF 143
- Figure 6-1. QOSPF Topology 144
- Enabling Route Pinning 146
- Chapter 7 149
- Configuring RSVP 149
- How RSVP Works 150
- Configuring RSVP Globally 152
- Choosing a Slot 153
- Caution: 154
- Setting the TTL Override 159
- Setting the Route Delay Value 160
- Chapter 8 163
- Reserving Line Resources 163
- Resource Manager 164
- Supported Media 165
- Chapter 9 179
- Configuring IGMP Relay 179
- IGMP Relay Overview 180
- IGMP Relay Topology 181
- How IGMP Relay Works 182
- Appendix A 203
- Site Manager Parameters 203
- DVMRP Parameters 204
- DVMRP Interface Parameters 209
- DVMRP Tunnel Parameters 214
- IGMP Parameters 218
- IGMP Static Host Parameters 223
- IP Configuration Parameters 227
- Resource Manager Parameters 229
- OSPF Global Parameters 235
- OSPF Interface Parameters 238
- RSVP Parameters 239
- RSVP Interface Parameters 240
- Multicast Policy Parameters 243
- IGMP Group Policy Parameters 257
- Appendix B 267
- Multicasting Tools 267
- <retry_count> 270
- <timeout_count> 270
- For example, the following 272
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