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PIM-DM (Dense Mode)
PIM-DM Operation
Switch/IGMP
Routing
Switch
(PIM & IGMP)
Routing
Switch
(PIM & IGMP)
Switch/IGMP
Routing
Switch
(PIM)
Switch/IGMP
Switch/IGMP
Switch/IGMP
Video Server
Multicast Tree
Hosts
Hosts
Figure 3-1. Example of Multicast “Tree” for a Given Flow
When the routing switch detects a new multicast flow, it initially floods the
traffic throughout the PIM-DM domain, and then prunes the traffic on the
branches (network paths) where joins have not been received from individual
hosts. This creates the ‘tree” structure shown above. The routing switch
maintains individual branches in the multicast tree as long as there is at least
one host maintaining a membership in the multicast group. When all of the
hosts in a particular VLAN drop out of the group, PIM-DM prunes that VLAN
from the multicast tree. Similarly, if the routing switch detects a join from a
host in a pruned VLAN, it adds that branch back into the tree.
Note Where the multicast routers in a network use one or more multinetted VLANs,
there must be at least one subnet common to all routers on the VLAN. This is
necessary to provide a continuous forwarding path for the multicast traffic on
the VLAN. Refer to the [ip pim-dense [ ip-addr < any | source-ip-address > ]
command under “PIM VLAN (Interface) Configuration Context” on page 3-15.
3-6
- ProCurve Switches 1
- Multicast and Routing Guide 3
- 3 PIM-DM (Dense Mode) 6
- 4 PIM-SM (Sparse Mode) 7
- 5 IP Routing Features 9
- Product Documentation 17
- Software Feature Index 18
- Intelligent Edge Software 19
- Features 19
- Getting Started 23
- Conventions 24
- Command Prompts 25
- Screen Simulations 25
- Sources for More Information 26
- Online Help 28
- Command Line Interface 29
- Web Browser Interface 29
- Need Only a Quick Start? 30
- Network 30
- Multicast (IGMP) 31
- IGMP Terms 34
- Basic Operation 35
- Enhancements 35
- How IGMP Operates 42
- Automatic Fast-Leave IGMP 44
- Forced Fast-Leave IGMP 47
- IGMP Proxy Forwarding 48
- VLAN Context Command 52
- IGMP Proxy Show Command 53
- Using the Switch as Querier 56
- Filtering 57
- PIM-DM (Dense Mode) 59
- PIM-DM Operation 63
- Multicast Flow Management 65
- PIM-DM Operating Rules 68
- Configuring PIM-DM 69
- Settings 80
- Displaying PIM Route Data 81
- Displaying PIM Status 86
- 3-13 on page 3-32 91
- Troubleshooting 95
- Applicable RFCs 99
- Multicast Routing MIB 100
- PIM-SM (Sparse Mode) 101
- Contents 102
- Introduction 104
- Feature Overview 105
- Terminology 106
- PIM-SM Operation 109
- Shortest-Path Tree (SPT) 110
- Trees (RPTs) 111
- PIM-SM Router Types 112
- Bootstrap Router (BSR) 113
- Rendezvous Point (RP) 114
- Planning Considerations 120
- Router PIM Configuration 123
- ■ IP routing 127
- ■ IP multicast routing 127
- Global Routing Configuration 128
- Note: Either RIP, OSPF, or 128
- PIM-SM Neighbor Notification 131
- SM Operation 135
- Notification Traps 141
- Router PIM Context 143
- Displaying PIM-SM Data and 146
- Configuration Settings 146
- Displaying PIM-Specific Data 151
- Routing Table 152
- Displaying PIM Neighbor Data 157
- Displaying BSR Data 159
- Displaying Candidate-RP Data 163
- Operating Notes 165
- Event Log Messages 166
- IP Routing Features 169
- Overview of IP Routing 174
- IP Interfaces 175
- IP Tables and Caches 175
- ARP Cache Table 176
- IP Route Table 176
- IP Forwarding Cache 177
- IP Route Exchange Protocols 178
- Switches 181
- Configuring ARP Parameters 183
- Enabling Proxy ARP 185
- Changing the TTL Threshold 186
- Configuring ICMP 187
- Configuring Static IP Routes 189
- Static IP Route Parameters 190
- Configuring RIP 194
- RIP Parameters and Defaults 195
- Configuring RIP Parameters 196
- Enabling IP RIP on a VLAN 197
- Displaying RIP Information 201
- Configuring OSPF 208
- Overview of OSPF 211
- OSPF Router Types 212
- Designated Routers 213
- OSPF Area Types 215
- Backbone Area 216
- Normal Area 216
- Not-So-Stubby-Area (NSSA) 217
- OSPF RFC Compliance 218
- Configuration Rules 222
- 1. Enable IP Routing 224
- Enable Global OSPF Routing 224
- Advertising to the Backbone 238
- Authentication 248
- Backbone 250
- Configuring a Virtual Link 251
- Displaying OSPF Information 258
- Description 274
- Field Description 276
- Currently Defined Areas: 276
- Next-Hop Routes 277
- Configuring IRDP 280
- Enabling IRDP Globally 281
- Displaying IRDP Information 282
- Configuring DHCP Relay 283
- Enabling DHCP Relay 284
- Hop Count in DHCP Requests 285
- Count Increment settings 287
- DHCP Option 82 288
- Option 82 Server Support 289
- Option 82 Field Content 292
- Forwarding Policies 295
- Packets 295
- Multinetted VLANs 299
- Configuring Option 82 299
- UDP Broadcast Forwarding 305
- Configuration 309
- Overview 313
- General Operation 315
- Virtual Router (VR) 318
- Virtual IP Address 318
- Master Router 319
- Owner Router 319
- Backup Router 320
- Virtual Router MAC Address 320
- VRRP and ARP 321
- General Operating Rules 321
- Basic Configuration Process 323
- Example Configuration 325
- With a VR 327
- Configuring VRRP 328
- Statistics Data 335
- VRRP Statistics Data 338
- Standards Compliance 343
- Symbols 347
- 2 – Index 348
- Index – 3 349
- 4 – Index 350
- Index – 5 351
- 6 – Index 352
- Index – 7 353
- 8 – Index 354
- Index – 9 355
- 10 – Index 356
- Index – 11 357
- 12 – Index 358
- 5991-8586 360
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