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Configuring IP Multicasting Services
4-6 114064 Rev. A
The principal items in a forwarding table entry are
Shortest-Path Trees
Route information used by DVMRP is independent of any other routing
information used by the router -- for example, routes provided by RIP. The
purpose of this routing information is to create a shortest-path tree entry in the
routing table for the propagation of multicast datagrams.
The shortest-path tree entry indicates the interface that provides the shortest path
to the network that is the source of the multicast datagram.
In
Figure 4-1, for example, the routing table on Router D includes an entry
describing the shortest-path route to the network connected to Router A. The entry
indicates that Interface d1 provides the shortest path to that source network.
A shortest-path tree also indicates those interfaces that are on the shortest path to
that source network from a neighboring router.
Router E considers the network connecting it to Router D to be on the shortest
path to the source network connected to router A. Router D has an interface -- d3
-- that is part of the shortest path from Router E from the network connected to
Router A.
If neighboring routers have the same metric to a given source network, the router
with the lower IP address will be responsible for propagating multicast traffic
originating from that source network onto the network or tunnel that is common to
these neighboring routers.
Source subnet The subnet containing a host that is the
source of multicast datagrams
addressed to the specified groups
Multicast group The Class D destination address
identifying the group to which the
datagram is being sent
Inbound interface The interface on which the multicast
datagram arrived
Outbound interfaces The interfaces out of which the
multicast datagram is forwarded
- Configuring IP 1
- Multicasting Services 1
- Bay Networks Software License 3
- Contents 5
- 114064 Rev. A vii 7
- 114064 Rev. A ix 9
- 114064 Rev. A xi 11
- About This Guide 13
- Conventions 14
- Acronyms 15
- 114064 Rev. A xvii 17
- Bay Networks Customer Service 18
- World Wide Web 19
- Customer Service FTP 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- Multicasting Overview 23
- Multicast Addresses 24
- Multicast Protocols 25
- Chapter 2 27
- Starting ST2 29
- Chapter 5 30
- Chapter 3 31
- Customizing IGMP 31
- IGMP Concepts and Terminology 32
- Configuring IGMP on the Router 33
- Configuring Logging 34
- Enabling and Disabling IGMP 35
- Specifying a Query Rate 35
- 3-6 114064 Rev. A 36
- Chapter 4 39
- Customizing DVMRP 39
- Neighbor Connections 40
- Figure 4-1. Multicast Routers 41
- Source Route Advertisements 42
- How DVMRP Chooses a Route 42
- Shortest-Path Trees 44
- Setting the Update Interval 45
- Configuring Tree Pruning 46
- Configuring DVMRP Timers 47
- 4-10 114064 Rev. A 48
- Specifying a Probe Interval 49
- Logging Debugging Messages 50
- Specifying an MTU Size 50
- Configuring DVMRP on a Circuit 52
- Specifying a Threshold 54
- Configuring a Forwarding Table 55
- Configuring a Tunnel 56
- Specifying the Cost 57
- Specifying a TTL 57
- 4-20 114064 Rev. A 58
- Customizing ST2 Services 59
- ST2 Concepts and Terminology 60
- ST20001A 61
- Stream Control Messages 62
- Neighbors and Tunnels 62
- Figure 5-2. ST2 Neighbors 63
- (continued) 64
- (continued) 65
- 5-8 114064 Rev. A 66
- 5-10 114064 Rev. A 68
- ST20002A 69
- Configuring ST2 on the Router 70
- Configuring an ST2 Interface 71
- 5-14 114064 Rev. A 72
- 5-16 114064 Rev. A 74
- Appendix A 75
- A-2 114064 Rev. A 76
- 114064 Rev. A A-3 77
- A-4 114064 Rev. A 78
- 79
- A-6 114064 Rev. A 80
- A-8 114064 Rev. A 82
- 83
- 114064 Rev. A A-11 85
- A-12 114064 Rev. A 86
- IGMP Parameters 87
- 88
- A-16 114064 Rev. A 90
- IP Configuration Parameters 91
- A-18 114064 Rev. A 92
- ST2 Parameters 93
- 114064 Rev. A A-21 95
- A-22 114064 Rev. A 96
- 114064 Rev. A A-23 97
- 99
- A-26 114064 Rev. A 100
- 114064 Rev. A Index-1 101
- 114064 Rev. A 102
- 114064 Rev. A Index-3 103
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