Dell Force10 S4820T S4820T Configuration Guide - Page 427

Membership Reports: Joining and Filtering Interface Multicast Group Filter Source Source Address Timer Mode Timer 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 Querier 1/1 2 Change to Include Type: 0x22 Number of Group Records: 1 Record Type: 3 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 3 IGMP Group-and-Source 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 Non-Querier IGMP Join message 1 Allow New 4 fnC0072mp 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 10.11.1.1 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 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. Internet Group Management Protocol (IGMP) | 427