Avaya Configuring IP Multicasting Services Instrukcja Użytkownika Strona 42
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Configuring IP Multicasting Services
4-4 114064 Rev. A
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 re-examines 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. 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. It 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, mrouted restricts a route to a total metric
value of 31 or less.)
- 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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