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Configuring IP Multicasting and Multimedia Services
9-6
117355-C Rev 00
In addition to soliciting multicast group membership information from directly
attached networks, the IGMP Relay device relays multicast data packets generated
by downstream hosts to the upstream IP multicast router. IGMP Relay also
receives multicast data packets from the upstream multicast router and forwards
them to the appropriate group members.
In Figure 9-4
, for example, the following events occur:
1. Host 1 generates a datagram addressed to a multicast group and sends it
upstream to the IGMP Relay device.
2. IGMP Relay forwards the multicast datagram upstream to the IP multicast
router. IGMP Relay also forwards the packet on a downstream interface to a
local group member.
3. The IP multicast router sends the datagram out the appropriate interface or
interfaces to remote group members.
Figure 9-4. IGMP Relay and Upstream Multicast Data
A downstream host can also send an unsolicited join message to the IGMP Relay
device. IGMP Relay forwards the message upstream to the IP multicast router.
IP0073A
IGMP Relay
IP
multicast
router
1.
3.
2.
LAN A
LAN B
LAN C
Host 1
Local
group
member
Remote
group
member
- Configuring IP 1
- Multicasting and 1
- Multimedia Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117355-C Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- How to Get Help 19
- Chapter 1 21
- Multicast Host Groups 22
- Multicast Addresses 23
- Resource Reservation Protocol 24
- Bay Networks Resource Manager 24
- IGMP Relay 25
- Multicast Table Manager 25
- Chapter 2 27
- Starting IGMP 28
- Starting DVMRP 29
- Starting MOSPF 30
- Starting RSVP 31
- Chapter 3 33
- IGMP Concepts and Terminology 34
- IGMP Host Reports 35
- Host Leave Messages 35
- Customizing Global IGMP 36
- Enabling and Disabling IGMP 37
- Configuring Logging 42
- Enabling Join Acknowledgments 43
- Accepting a Nonlocal Report 45
- Specifying a Query Rate 48
- Configuring IGMP Policies 56
- Chapter 4 59
- Neighbor Connections 60
- Figure 4-1. Multicast Routers 61
- Source Route Advertisements 62
- How DVMRP Chooses a Route 63
- Routing Table 64
- Shortest-Path Trees 65
- Tree Pruning 65
- Customizing DVMRP Globally 66
- Setting the Update Interval 68
- Setting the Leaf Timer 77
- Specifying a Probe Interval 79
- Logging Debugging Messages 85
- Listening for a Default Route 100
- Using the BCC 101
- Using Site Manager 102
- Configuring a Tunnel 104
- Specifying the Cost 110
- Specifying a Threshold 111
- Advertising a Default Route 114
- Configuring DVMRP Policies 120
- Customizing DVMRP 121
- (continued) 122
- Configuring an Accept Policy 124
- Table 4-5 127
- Chapter 5 131
- MOSPF Overview 132
- • All multicasting types 133
- Configuring MOSPF Globally 134
- Enabling Dynamic TTL 139
- Chapter 6 143
- Configuring QOSPF 143
- Figure 6-1. QOSPF Topology 144
- Enabling Route Pinning 146
- Chapter 7 149
- Configuring RSVP 149
- How RSVP Works 150
- Configuring RSVP Globally 152
- Choosing a Slot 153
- Caution: 154
- Setting the TTL Override 159
- Setting the Route Delay Value 160
- Chapter 8 163
- Reserving Line Resources 163
- Resource Manager 164
- Supported Media 165
- Chapter 9 179
- Configuring IGMP Relay 179
- IGMP Relay Overview 180
- IGMP Relay Topology 181
- How IGMP Relay Works 182
- Appendix A 203
- Site Manager Parameters 203
- DVMRP Parameters 204
- DVMRP Interface Parameters 209
- DVMRP Tunnel Parameters 214
- IGMP Parameters 218
- IGMP Static Host Parameters 223
- IP Configuration Parameters 227
- Resource Manager Parameters 229
- OSPF Global Parameters 235
- OSPF Interface Parameters 238
- RSVP Parameters 239
- RSVP Interface Parameters 240
- Multicast Policy Parameters 243
- IGMP Group Policy Parameters 257
- Appendix B 267
- Multicasting Tools 267
- <retry_count> 270
- <timeout_count> 270
- For example, the following 272
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