Dell PowerConnect 8100 User's Configuration Guide - Page 1180
multicast source. This requires that the first-hop router perform
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Page 1180 highlights
• At this point, the RP no longer needs the flow of (S, G) traffic since all branches of the Shared Tree (in this case there is only one) have pruned off the flow of (S, G) traffic. • As a result, the RP will send (S, G) Prunes back toward the source to shut off the flow of the now unnecessary (S, G) traffic to the RP. NOTE: This will occur if the RP has received an (S, G) RP-bit Prune on all interfaces on the Shared Tree. Figure 43-8. PIM-SM SPT-Part 5 • As a result of the SPT-Switchover, (S, G) traffic is now flowing only from the first-hop router to the last-hop router and from there to the receiver. Notice that traffic is no longer flowing to the RP. The PIM standard requires support for multi-hop RP in that a router running PIM can act as an RP even if it is multiple router hops away from the multicast source. This requires that the first-hop router perform encapsulation of the multicast data and forward it as unicast toward the RP. In practice, this encapsulation is almost always performed in software due to the complexity of the operation. Likewise, the RP must perform deencapsulation and forwarding of the multicast packets in software. This 1180 Managing IPv4 and IPv6 Multicast
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-
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
-
1,235
-
1,236
-
1,237
-
1,238
-
1,239
-
1,240
-
1,241
-
1,242
-
1,243
-
1,244
-
1,245
-
1,246
-
1,247
-
1,248
-
1,249
-
1,250
-
1,251
-
1,252
-
1,253
-
1,254
-
1,255
-
1,256
-
1,257
-
1,258
-
1,259
-
1,260
-
1,261
-
1,262
-
1,263
-
1,264
-
1,265
-
1,266
-
1,267
-
1,268
-
1,269
-
1,270
-
1,271
-
1,272
-
1,273
-
1,274
-
1,275
-
1,276
-
1,277
-
1,278
-
1,279
-
1,280
-
1,281
-
1,282
-
1,283
-
1,284
-
1,285
-
1,286
-
1,287
-
1,288
-
1,289
-
1,290
-
1,291
-
1,292
-
1,293
-
1,294