Download  Print this page
   
1
2
Table of Contents
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487

Advertisement

2.
After receiving the leave message, the querier sends a configurable number of IGMP
group-specific queries to the group that the host is leaving. Both the destination address field
and the group address field of the message are the address of the multicast group that is being
queried.
3.
One of the remaining members (if any on the subnet) in the group should send a report within
the maximum response time advertised in the group-specific queries.
4.
If the querier receives a report for the group before the maximum response timer expires, it
maintains the memberships for the group. Otherwise, the querier assumes that the local subnet
has no member hosts for the group and stops maintaining the memberships for the group.

IGMPv3 enhancements

IGMPv3 is based on and is compatible with IGMPv1 and IGMPv2. It enhances the control
capabilities of hosts and the query and report capabilities of IGMP routers.
Enhancements in control capability of hosts
IGMPv3 introduced two source filtering modes (Include and Exclude). These modes allow a host to
receive or reject multicast data from the specified multicast sources. When a host joins a multicast
group, one of the following occurs:
If the host expects to receive multicast data from specific sources like S1, S2, ..., it sends a
report with the Filter-Mode denoted as "Include Sources (S1, S2, ...)."
If the host expects to reject multicast data from specific sources like S1, S2, ..., it sends a report
with the Filter-Mode denoted as "Exclude Sources (S1, S2, ...)."
As shown in
Both of these sources can send multicast data to the multicast group G. Host B wants to receive the
multicast data addressed to G from Source 1 but not from Source 2.
Figure 35 Flow paths of source-and-group-specific multicast traffic
Source 1
Source 2
In IGMPv1 or IGMPv2, Host B cannot select multicast sources when it joins the multicast group G.
The multicast streams from both Source 1 and Source 2 flow to Host B whether or not it needs them.
In IGMPv3, Host B can explicitly express that it needs to receive multicast data destined to the
multicast group G from Source 1 but not from Source 2.
Enhancements in query and report capabilities
IGMPv3 introduces IGMP group-and-source queries and IGMP reports carrying group records.
Query message carrying the source addresses
Figure
35, the network has two multicast sources: Source 1 (S1) and Source 2 (S2).
Packets (S1,G)
Packets (S2,G)
Host A
Receiver
Host B
Host C
93

Advertisement

Table of Contents

   Also See for HP FlexFabric 5950 series

Comments to this Manuals

Symbols: 0
Latest comments: