Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 588
MLD Querier Router, Joining a Multicast Group, Maximum Response Delay, Multicast Address
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www.dell.com | support.dell.com Figure 30-1 shows the packet structure of MLD version 1 packets. • Maximum Response Delay-the maximum amount of time that the Querier waits to receive a response to a General or Multicast-Address-Specific Query. The value is zero in reports and Done messages. • Multicast Address - set to zero in General Queries, and set to the relevant multicast address in multicast-address-specific queries and done messages. Figure 30-1. MLD version 1 Packet Structure Preamble Start Frame Delimiter Destination MAC 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 Code: 130: Multicast Listener Query 131: Multicast Listener Report 132: Multicast Listener Done MLD 001 MLD Querier Router MLD routers periodically ask connected hosts in which, if any, multicasts groups they are interested. For any subnet, only on router solicit hosts for this information; this router is called the Querier, and all the other routers on the subnet are non-queriers. Initially, each router assumes that it is the Querier, and transmits queries. If a router receives a query with a source IP address lower than its own, it stops transmitting queries, and so the router with the lowest IP address is ultimately elected the Querier for the subnet. Joining a Multicast Group The Querier periodically sends a General Query to the all-nodes multicast address FF02::1. A host that wants to join a multicast group responds to the general query with a report that contains (in the MLD Multicast Address field, Figure 30-1) the group address; the report is also addressed to the group (in the IPv6 Destination Address field). To avoid duplicate reporting, any host that hears a report from another host for the same group in which it itself is interested cancels its report for that group. A host does not have to wait for a General Query to join a group. If a host wants to become a member of a group for which the router is not currently forwarding traffic, it should send an unsolicited report. When a router receives a report for a group, it either creates a new entry in the group membership table, or it updates an existing entry by adding the interface on which the report arrived to the outgoing interface list for the group. 588 | Multicast Listener Discovery
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