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Configuring IP Multicasting Services
4-4 114064 Rev. B
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 a route exists, DVMRP compares the cost of the two
routes. DVMRP stores the route with the lower cost in its routing table.
A router will not send out 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. However, a router will continue to send probes periodically on an
interface.
How DVMRP Chooses a Route
Each DVMRP interface is configured with a metric that indicates the cost of the
hop. A router that receives multiple route reports for the same multicasting source
network compares the cost specified in each (based on the metric field) and stores
information from the report with the lowest cost in its routing table.
A route metric is the sum of all the interface (hop) metrics from a given route
source to a given router. Currently, DVMRP restricts a route via multicast hosts
(mrouted) to a total metric value of 31 or less.
- Configuring IP 1
- Multicasting Services 1
- USA Requirements Only 3
- Canada Requirements Only 5
- T1 Service 8
- Bay Networks Software License 9
- (continued) 10
- Contents 11
- 114064 Rev. B 12
- About This Guide 21
- Conventions 22
- Acronyms 23
- Bay Networks Customer Service 24
- How to Get Help 25
- For More Information 25
- Chapter 1 27
- Multicasting Overview 27
- Multicast Addresses 28
- Multicast Protocols 29
- Chapter 2 31
- Starting ST2 33
- Click on OK 34
- Chapter 3 35
- Customizing IGMP 35
- IGMP Concepts and Terminology 36
- Configuring IGMP on the Router 37
- Configuring Logging 38
- Enabling and Disabling IGMP 39
- Specifying a Query Rate 39
- 3-6 114064 Rev. B 40
- Chapter 4 43
- Customizing DVMRP 43
- Neighbor Connections 44
- Figure 4-1. Multicast Routers 45
- Source Route Advertisements 46
- How DVMRP Chooses a Route 46
- Shortest-Path Trees 48
- Setting the Update Interval 49
- Configuring Tree Pruning 50
- Configuring DVMRP Timers 51
- 4-10 114064 Rev. B 52
- Specifying a Probe Interval 53
- Logging Debugging Messages 54
- Specifying an MTU Size 54
- Configuring DVMRP on a Circuit 55
- Specifying a Threshold 56
- Configuring a Forwarding Table 57
- Configuring a Tunnel 58
- Specifying the Cost 59
- Specifying a TTL 59
- 4-18 114064 Rev. B 60
- Chapter 5 61
- Customizing ST2 Services 61
- ST2 Concepts and Terminology 62
- Stream Control Messages 64
- Neighbors and Tunnels 64
- Resource Manager 65
- ST2 Features 66
- 5-8 114064 Rev. B 68
- 5-10 114064 Rev. B 70
- Configuring ST2 on the Router 72
- Configuring an ST2 Interface 73
- 5-14 114064 Rev. B 74
- Table 5-2. ST2 Timers 74
- Chapter 6 77
- Reserving Line Resources 77
- Supported Media 78
- Starting the Resource Manager 79
- Click on Values 80
- 6-6 114064 Rev. B 82
- 6-8 114064 Rev. B 84
- 6-10 114064 Rev. B 86
- 114064 Rev. B 6-13 89
- Appendix A 91
- 114064 Rev. B A-3 93
- A-4 114064 Rev. B 94
- 114064 Rev. B A-5 95
- A-8 114064 Rev. B 98
- 99
- 100
- 114064 Rev. B A-11 101
- IGMP Parameters 102
- 104
- A-16 114064 Rev. B 106
- IP Configuration Parameters 107
- A-18 114064 Rev. B 108
- ST2 Parameters 109
- 114064 Rev. B A-21 111
- A-22 114064 Rev. B 112
- 114064 Rev. B A-23 113
- 115
- A-26 114064 Rev. B 116
- Resource Manager Parameters 117
- 118
- 118
- 114064 Rev. B A-29 119
- 121
- A-32 114064 Rev. B 122
- 114064 Rev. B Index-1 123
- 114064 Rev. B Index-3 125
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