756 Configuring IP Multicast
• 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.
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