Avaya Configuring IP Multicasting Services Bedienungsanleitung Seite 43
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Customizing DVMRP
114064 Rev. A 4-5
In Figure 4-1, for example, Router D receives two reports for the network
connected to multicasting Router A, one from Router B and one from Router C.
Using the metrics contained in the route reports, Router D determines that the cost
of the tunneled route is greater than the cost of the route that uses direct physical
connections. Router D discards the route received from Router C and stores the
route received from Router B.
Router D then declares Router B to be the next-hop neighbor and Interface d1 to
be the next-hop interface. Once a next-hop neighbor has been declared for a route,
the route updates received from that neighbor for that route take precedence until
either the route times out or another router advertises a better metric for that route.
Routing Table and Forwarding Table
The principal items in a routing table entry are
Note that the source subnet and the previous hop router in the DVMRP routing
table are the opposite of the destination subnet and new hop router in a RIP
routing table.
Using this information, the router can
1. Receive a multicast datagram and determine if the datagram has arrived on the
interface that is on the shortest path to the source network.
2. Drop the datagram if it has not arrived on the shortest-path interface.
3. Flood the multicast datagram to all active DVMRP neighbors.
Once DVMRP has received a multicast datagram on an interface and flooded the
datagram to its neighbor, DVMRP makes an entry for the datagram in the
forwarding table for the interface.
Source subnet address and mask
Address and mask of a subnetwork
containing a host sourcing multicast
datagrams
From-gateway The previous hop router leading back
to the source subnet
TTL The number of seconds before this
entry is removed from the routing table
- 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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