Dell PowerConnect 8100 User's Configuration Guide - Page 1177
Phase 3: Shortest Path Tree, This S, G Join messages travels hop-by-hop to the first-hop router i.e.
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Phase 3: Shortest Path Tree Figure 43-4. PIM-SM SPT-Part 1 • PIM-SM has the capability for last-hop routers (i.e., routers with directly connected group members) to switch to the Shortest-Path Tree and bypass the RP. This switchover is based upon an implementation-specific function called SwitchToSptDesired(S,G) in the standard and generally takes a number of seconds to switch to the SPT. • In the above example, the last-hop router (at the bottom of the drawing) sends an (S, G) Join message toward the source to join the SPT and bypass the RP. • This (S, G) Join messages travels hop-by-hop to the first-hop router (i.e., the router connected directly to the source), thereby creating another branch of the SPT. This also creates (S, G) state in all the routers along this branch of the SPT. Managing IPv4 and IPv6 Multicast 1177
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-
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