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Configuring IP Multicasting and Multimedia Services
1-22
117355-A Rev. A
Multicast Host Groups
IP multicasting is a method for addressing, routing, and delivering a datagram to a
collection of receivers -- called a
host
group
.
Host groups can be permanent or transient.
• A
permanent host group
has a well-known, administratively assigned IP
multicast group address. The address, not the membership, is permanent and
defines the group. A permanent host group can consist of zero or more
members.
• A
transient host group
exists only as long as it has members that need its
services. IP addresses in the multicast range that are not reserved for
permanent groups are available for dynamic assignment to transient host
groups.
Any host system on any IP network can send a message to a multicast group using
the group’s IP multicast address. To receive a message addressed to a multicast
group, however, the host must be a member of the group and must reside on a
network where that group is registered with a local multicast router.
An IP multicasting host group can consist of zero or more members and places no
restrictions on its membership. Host members can reside anywhere; they can join
and leave the group at any time; and they can be members of more than one group
at the same time. In order to receive a multicast message from a host group, a host
must be a member of the group. However, anyone can send a multicast datagram:
a host does not need to be a member of a group to send a multicast message to its
members.
In general, hosts that are members of the same group reside on different networks.
However, a range of multicast addresses (224.0.0.
x
) is reserved for groups that are
locally scoped. All message traffic for these hosts remains on the local network.
Hosts that belong to a group in this address range and that reside in different
networks will not receive each other’s message traffic.
Note:
Multicast data packets are affected by traffic filters. Therefore, you must
ensure that traffic filters configured on a multicast router do not prevent a host
that is a member of a group from receiving packets intended for that group.
- 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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