Dell PowerConnect 8024F User's Guide - Page 756

• Few senders -to- many receivers (due to frequent flooding) • High volume of multicast traffic • Constant stream of traffic Protocol Independent Multicast-Sparse Mode (PIM-SM) is used to efficiently route multicast traffic to multicast groups that may span wide area networks and where bandwidth is a constraint. PIM-SM uses shared trees by default and implements source-based trees for efficiency. This data threshold rate is used to toggle between trees. PIM-SM assumes that no hosts want the multicast traffic unless they specifically ask for it. It creates a shared distribution tree centered on a defined rendezvous point (RP) from which source traffic is relayed to the receivers. Senders first send the multicast data to the RP, which in turn sends the data down the shared tree to the receivers. Shared trees centered on a RP do not necessarily provide the shortest/optimal path. In such cases, PIM-SM provides a means to switch to more efficient source-specific trees. The PIM menu page contains links to web pages that define and display PIM-DM and PIM-SM parameters and data. Only one PIM protocol can be enabled on the switch at a time. To display the PIM page, click IPv4 Multicast →PIM or IPv6 Multicast →PIM in the tree view. Following are the web pages accessible from this menu page: • PIM Global Configuration • PIM Global Status • PIM Interface Configuration • Interface Summary • Candidate RP Configuration • Static RP Configuration • SSM Range Configuration • BSR Candidate Configuration • BSR Candidate Summary PIM Global Configuration Use the PIM Global Configuration page to configure the administrative status of PIM-DM or PIM-SM on the switch. To display the page, click IPv4 Multicast →PIM →Global Configuration or IPv6 Multicast →PIM → Global Configuration in the navigation tree. 756 Configuring IP Multicast