Dell PowerConnect 8100 User's Configuration Guide - Page 1181
PowerConnect Optimizations to PIM-SM, to the SPT tree by sending a PIM S
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creates a performance problem in that it limits the number of packets that can be processed and places a high load on the CPUs in the first hop and RP routers, which can then adversely affect other router functions. PowerConnect Optimizations to PIM-SM PowerConnect Switches performs the following optimizations to reduce the impact of multicast encapsulation/de-encapsulation and provide a higher level of multicast performance in the network. • Limiting the number of packets sent to the RP by the first-hop router. When a multicast data source (S) starts sending data destined for a multicast group (G), the first-hop router receives these packets and traps them to its local CPU. A PowerConnect first-hop router immediately blocks further data packets in the stream and prevents them from reaching the CPU. The first-hop router then unicast-encapsulates the first received data packet in the form of a PIM Register message and software forwards it to the RP. When a PowerConnect first-hop router subsequently receives the PIM Join from the RP, the block is replaced with a regular multicast forwarding entry so that subsequent data packets are forwarded in the hardware. If the initial Register message(s) does not reach the RP, or the PIM Join sent in response does not reach the first-hop router, then the data stream would never get forwarded. To solve this, the negative entry is timed out and removed after 3 seconds so that the process can be repeated until it succeeds. • In Phase 3-Shortest Path Tree, the last-hop router initiates a switchover to the SPT tree by sending a PIM (S,G) Join message towards the source as soon as it receives the first data packet via the (*,G) shared tree. Per the standard, this function is used to detect suboptimal routing of multicast traffic. PowerConnect multicast eliminates the SwitchToSptDesired(S,G) function and performs as if the SwitchToSptDesired(S,G) function always returns "true" as soon as it receives the first multicast packet instead of waiting for 30 seconds. • PowerConnect RPs do not wait to receive the native multicast data but immediately respond to the PIM (S,G) Join by sending a 'Register Stop' message to the source's first-hop router to inform it that it can stop Managing IPv4 and IPv6 Multicast 1181
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1,185
-
1,186
-
1,187
-
1,188
-
1,189
-
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
-
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