Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 589
Leaving a Multicast Group, MLD version 2, Multicast Listener Query, General Query
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Leaving a Multicast Group A receiver that is no longer interested in traffic for a particular group should leave the group by sending a Done message to the link-scope all-routers multicast address, FF02::02. When a Querier receives a Done message, it sends a Multicast-Address-Specific Query addressed to the relevant multicast group. Hosts still interested in receiving traffic for that group (according to the suppression mechanism) so that the group table entry is maintained. If no reports are received in response to the query, the group membership entry is cleared and the router stops forwarding traffic for that group. MLD version 2 MLD version 2 (MLDv2) adds source-filtering capability. A node can report interest in multicast traffic only from specific source addresses or from all sources except for specific source addresses. MLDv2 is backwards compatible with MLD version 1. There are two types of MLDv2 messages • Multicast Listener Query - a message sent by the Querier to discover multicast listeners (Figure 30-2). • General Query - a query to which all listeners should respond. • Multicast-Address-Specific Query - a query to which listeners for the specified group should respond to affirm their membership. • Multicast-Address-and-Source-Specific Query - a query to determine if there are any listeners interested in a group and source pair. • Version 2 Multicast Listener Report - a response to a query indicating listening state or state changes (Figure 30-3). Figure 30-2. MLDv2 Multicast Listener Query Preamble Start Frame Destination MAC Delimiter Source MAC Ethernet Type IPv6 Packet Padding FCS Version (6) Traffic Class Flow Label Payload Length Next Header (0) Hop Limit (1) Next Header (58) Header Extension Length (0) Options (Router Alert) ICMPv6 Packet Type Code (0) Checksum Max. Response Delay Reserved Multicast Address Reserved S Querier Robustness Variable Querier's Query N Interval Code Source Addresses Code: 130: Multicast Listener Query 131: Multicast Listener Report 132: Multicast Listener Done MLD 002 Multicast Listener Discovery | 589
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