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Customizing IGMP
117355-A Rev. A 3-3
IGMP Host Reports
A host that receives a membership query from a local router can respond with a
host membership report, one report for each joined multicast group. A host that
receives a query delays its reply by a random interval and listens for a reply from
any other host in the same host group. Consider a network that includes two host
members -- Host A and Host B -- of the same multicast group. The router sends
out a host membership query on the local network. Host A and Host B both
receive the query and listen on the network for a host membership report. Host B’s
delay time expires first, so it responds to the query with a membership report.
Hearing the response, Host A does not send a report of its own for the same group.
Each query from a router to a host includes a code field. IGMP inserts a
value -- n -- into this field specifying the maximum time in tenths of a second
within which the host must issue a reply. The host uses this value to calculate a
random value between 0 and n tenths of a second for the period that it waits before
sending a response.
If at least one host on the local network specifies that it is a member of a given
group, the router will forward to that network all datagrams bearing the group’s
multicast address.
Upon initialization, the host may immediately issue a report for each of its
supported multicast groups. The router accepts and processes these asynchronous
reports the same way it accepts requested reports.
Once in a steady state, hosts and routers communicate in a way that minimizes the
exchange of queries and reports.
Host Leave Messages
When a Version 2 host leaves a group, it issues a host leave message. The
multicast router on the network issues a group-specific query to determine
whether there are other group members on the network. If no host responds to the
query, the router assumes that no members belonging to that group exist on that
interface.
- Configuring IP 1
- Multicasting and 1
- Multimedia Services 1
- Contents 5
- 117355-A Rev. A 11
- About This Guide 15
- Before You Begin 16
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 19
- Chapter 1 21
- Multicast Host Groups 22
- Multicast Extensions to OSPF 24
- Resource Reservation Protocol 24
- Bay Networks Resource Manager 24
- Multicast Table Manager 25
- Chapter 2 27
- Starting IGMP 28
- Starting DVMRP 29
- Starting MOSPF 30
- Starting RSVP 31
- 2-32 117355-A Rev. A 32
- Chapter 3 33
- Customizing IGMP 33
- IGMP Concepts and Terminology 34
- IGMP Host Reports 35
- Host Leave Messages 35
- Customizing Global IGMP 36
- Enabling and Disabling IGMP 37
- Using the BCC 38
- Using Site Manager 39
- Configuring Logging 41
- Enabling Join Acknowledgments 42
- 3-12 117355-A Rev. A 44
- Specifying a Query Rate 46
- Chapter 4 53
- Customizing DVMRP 53
- Neighbor Connections 54
- Figure 4-1. Multicast Routers 55
- Source Route Advertisements 56
- How DVMRP Chooses a Route 57
- Routing Table 58
- Shortest-Path Trees 59
- Customizing DVMRP Globally 60
- Setting the Update Interval 62
- Configuring Tree Pruning 63
- Configuring DVMRP Timers 64
- 4-14 117355-A Rev. A 66
- Specifying a Probe Interval 68
- 4-18 117355-A Rev. A 70
- Logging Debugging Messages 71
- 4-20 117355-A Rev. A 72
- 4-22 117355-A Rev. A 74
- 4-24 117355-A Rev. A 76
- Specifying a Threshold 77
- TTL value from 1 to 254 78
- Configuring a Forwarding Table 79
- 4-28 117355-A Rev. A 80
- Advertising a Default Route 82
- Listening for a Default Route 83
- 4-32 117355-A Rev. A 84
- Configuring a Tunnel 85
- 4-34 117355-A Rev. A 86
- 4-36 117355-A Rev. A 88
- Specifying the Cost 89
- Specifying a TTL 90
- 4-40 117355-A Rev. A 92
- 4-44 117355-A Rev. A 96
- Chapter 5 97
- MOSPF Overview 98
- • All multicasting types 99
- Configuring MOSPF Globally 100
- 5-6 117355-A Rev. A 102
- Enabling Dynamic TTL 104
- Chapter 6 107
- Configuring QOSPF 107
- Figure 6-1. QOSPF Topology 108
- 6-2 117355-A Rev. A 108
- Configuring QOSPF 109
- Enabling Route Pinning 110
- 6-6 117355-A Rev. A 112
- Chapter 7 113
- Configuring RSVP 113
- How RSVP Works 114
- Configuring RSVP 115
- Configuring RSVP Globally 116
- Choosing a Slot 117
- 7-6 117355-A Rev. A 118
- 7-8 117355-A Rev. A 120
- 7-10 117355-A Rev. A 122
- Setting the TTL Override 123
- Setting the Route Delay Value 124
- Chapter 8 127
- Reserving Line Resources 127
- Resource Manager 128
- Supported Media 129
- 8-4 117355-A Rev. A 130
- 8-6 117355-A Rev. A 132
- 8-8 117355-A Rev. A 134
- 8-10 117355-A Rev. A 136
- 8-12 117355-A Rev. A 138
- 8-14 117355-A Rev. A 140
- 8-16 117355-A Rev. A 142
- Appendix A 143
- Site Manager Parameters 143
- DVMRP Parameters 144
- A-4 117355-A Rev. A 146
- 148
- A-8 117355-A Rev. A 150
- 151
- 153
- A-12 117355-A Rev. A 154
- 155
- IGMP Parameters 157
- 158
- IP Configuration Parameters 162
- Resource Manager Parameters 164
- 165
- 166
- 168
- A-28 117355-A Rev. A 170
- 171
- 171
- 171
- 172
- 174
- RSVP Parameters 175
- 176
- A-36 117355-A Rev. A 178
- Appendix B 179
- Multicasting Tools 179
- <source> 181
- <destination> 181
- <group> 181
- <retry_count> 182
- <timeout_count> 182
- 183
- 184
- 184
- 117355-A Rev. A Index-1 185
- 117355-A Rev. A Index-3 187
- 117355-A Rev. A Index-5 189
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