Leaving And Staying In Groups - Dell Force10 Z9000 Configuration Manual

Figure 18-4. IGMP Membership Reports: Joining and Filtering
Interface Multicast Group Filter Source Source
Address Timer Mode
1/1 224.1.1.1 GMI Exclude
None
1/1 224.1.1.1 Include
10.11.1.1 GMI
1/1 224.1.1.1 Include
10.11.1.1 GMI
10.11.1.2 GMI
Type: 0x22
Number of Group Records: 1
Record Type: 3
2 Change to Include
Number of Sources: 1
Multicast Address: 224.1.1.1
Source Address: 10.11.1.1
State-change reports retransmitted
Query Robustness Value-1 times at
Unsolicited Report Interval

Leaving and Staying in Groups

Figure 18-5 shows how multicast routers track and refresh state changes in response to group-and-specific
and general queries.
1. Host 1 sends a message indicating it is leaving group 224.1.1.1 and that the include filter for 10.11.1.1
and 10.11.1.2 are no longer necessary.
2. The querier, before making any state changes, sends a group-and-source query to see if any other host
is interested in these two sources; queries for state-changes are retransmitted multiple times. If any are,
they respond with their current state information and the querier refreshes the relevant state
information.
3. Separately in
4. Host 2 responds to the periodic general query so the querier refreshes the state information for that
group.
Membership Reports: Joining and Filtering
Querier
Timer
1/1
Figure 18-5, the querier sends a general query to 224.0.0.1.
IGMP Group-and-Source
3
Specific Query
Type: 0x11
Group Address: 244.1.1.1
Number of Sources: 1
Source Address: 10.11.1.1
Type: 0x22
Number of Group Records: 1
Record Type: 4
Number of Sources: 0
Multicast Address: 224.1.1.1
Type: 0x22
Number of Group Records: 1
Record Type: 5
Number of Sources: 1
Multicast Address: 224.1.1.1
Source Address: 10.11.1.2
Internet Group Management Protocol (IGMP) | 365
Non-Querier
IGMP Join message
1
Allow New
4
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