Dell PowerConnect M6220 User's Guide - Page 703
Protocol Independent Multicast-Dense Mode, IGMP Proxy Interface Membership Info Detailed, Interface
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Displaying Detailed IGMP Proxy Interface Membership Info 1. Open the IGMP Proxy Interface Membership Info Detailed page. 2. Select the interface to display from the Interface drop-down menu. 3. Select the desired Multicast Group IP. Detailed membership data for this interface and multicast group IP displays. Displaying Detailed IGMP Proxy Interface Membership Info using the CLI Command For information about the CLI command that performs this function, see the following chapter in the CLI Reference Guide: • IGMP Proxy Commands Protocol Independent Multicast-Dense Mode Protocol Independent Multicast-Dense Mode (PIM-DM) protocol is a simple, protocol-independent multicast routing protocol. It uses an existing Unicast routing table and a Join/Prune/Graft mechanism to build a tree. PIM-DM creates source-based shortest-path distribution trees that make use of RPF. It cannot be used to build a shared distribution tree, as is the case in PIM-SM. PIM-DM assumes that when a sender starts sending data, all downstream routers and hosts want to receive a multicast datagram. PIM-DM initially floods multicast traffic throughout the network. Routers that do not have any downstream neighbors prune back the unwanted traffic. In addition to PRUNE messages, PIM-DM makes use of graft and assert messages. Graft messages are used whenever a new host wants to join the group. Assert messages are used to shutoff duplicate flows on the same multi-access network. There are two versions of PIM-DM. Version 2 doesn't use the IGMP message; instead, it uses a message that is encapsulated in IP package, with protocol number 103. In Version 2, Hello message is introduced in place of query message. PIM-DM is appropriate for: • Densely distributed receivers • Few senders -to- many receivers (due to frequent flooding) • High volume of multicast traffic • Constant stream of traffic The PIM-DM menu page contains links to web pages that define and display PIM-DM parameters and data. To display this page, click IP Multicast > PIM-DM in the tree view. Following are the web pages accessible from this menu page: • PIM-DM Global Configuration • PIM-DM Global Status • PIM-DM Interface Configuration • PIM-DM Interface Summary Configuring IP Multicast 701