Warning: Declaration of Suffusion_MM_Walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /homepages/5/d692508392/htdocs/clickandbuilds/l3switching/wp-content/themes/suffusion/library/suffusion-walkers.php on line 39
Jul 092012
 

Using PIM in sparse mode is much more effective, because of the explicit requests. A multicast packet is only flooded from the sender to the first hop router. Only when a client requests data, the multicast packets are flooded out of the broadcast domain. The core control point of PIM-Sparse mode is the Rendezvous Point (RP). The RP tracks all the senders and receivers in the multicast domain.

In the figure below the loopback 0 of R1 is configured as the RP address. OSPF area 0 and PIM in sparse mode is enabled on all interfaces of all routers.

Let us check the scenario when a multicast receiver joins to a group. We assume now there are no senders.

  • Client sends an IGMP membership report out on the LAN.
  • IGMP join will then the converted to PIM join and sent upstream to the RP.
  • A (*,G) entry will be installed on all routers in the IGP path to RP

Continue reading »