Leaving And Staying In Groups - Dell Force10 S4810P Configuration Manual

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

The illustration below 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 10.1 1.1.1
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 the following illustration, the querier sends a general query to 224.0.0.1.
4. Host 2 responds to the periodic general query so the querier refreshes the state information for that
group.
3
Querier
Timer
Type: 0x11
Group Address: 244.1.1.1
Number of Sources: 1
Source Address: 10.11.1.1
1/1
IGMP Group-and-Source
Specific Query
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) | 463
Non-Querier
IGMP Join message
1
Allow New
4
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