Dell PowerConnect 7024 User Manual - Page 1143
What Is PIM?, Using, PIM-SM as the Multicast Routing Protocol
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Page 1143 highlights
What Is PIM? The Protocol Independent Multicast protocol is a simple, protocolindependent multicast routing protocol. PIM uses an existing unicast routing table and a Join/Prune/Graft mechanism to build a tree. PIM PowerConnect 7000 Series switches support two types of PIM: sparse mode (PIM-SM) and dense mode (PIM-DM). PIM-SM is most effective in networks with a sparse population of multicast receivers. In contrast, PIM-DM is most effective in networks with densely populated multicast receivers. In other words, PIM-DM can be used if the majority of network hosts request to receive a multicast stream, while PIMSM might be a better choice in networks in which a small percentage of network hosts, located throughout the network, wish to receive the multicast stream. Using PIM-SM as the Multicast Routing Protocol PIM-SM is used to efficiently route multicast traffic to multicast groups that may span wide area networks where bandwidth is a constraint. PIM-SM uses shared trees by default and implements source-based trees for efficiency; it assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined rendezvous point (RP) from which source traffic is relayed to the receivers. Senders first send the multicast data to the RP, which in turn sends the data down the shared tree to the receivers. Shared trees centered on an RP do not necessarily provide the shortest, most optimal path. In such cases, PIM-SM provides a means to switch to more efficient source-specific trees. A data threshold rate is configured to determine when to switch from shared-tree to source-tree. PIM-SM uses a Bootstrap Router (BSR), which advertises information to other multicast routers about the RP. In a given network, a set of routers can be administratively enabled as candidate bootstrap routers. If it is not apparent which router should be the BSR, the candidates flood the domain with advertisements. The router with the highest priority is elected. If all the priorities are equal, then the candidate with the highest IP address becomes the BSR. Managing IPv4 and IPv6 Multicast 1143
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1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
-
1,204
-
1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234