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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring PIM-SM

Configuring PIM-SM

On a PIM-SM network, any sender can be a multicast source, and receivers cannot know multicast source addresses before they join multicast groups. A Rendezvous Point (RP) is the forwarding core on a PIM-SM network. RPs are categorized as static RPs or BootStrap router (BSR) RPs, responsible for collecting multicast source information and group member information.

Usage Scenario

On a large-scale network where multicast group members are sparsely located and receivers do not need to specify multicast sources when they join multicast groups, you can configure PIM-SM. An RP is the forwarding core on a PIM-SM network. Group members and the multicast source converge at the RP.

  • After creating a (*, G) entry for a new IGMP member relationship, the receiver's Designated router (DR) sends a Join/Prune message to the RP.

  • When a multicast source starts to send data to a group, the source's DR unicasts a Register message to the RP. After receiving the Register message, the RP decapsulates it and then forwards the data to other multicast members along the rendezvous point tree (RPT).

  • The RP switches traffic from the RPT to the shortest path tree (SPT), and then the RP sends a Register-Stop message to the source's DR.

PIM-SM supports static RPs and BSR RPs.

  • Static RP

    To use a static RP, manually configure the same RP address on each router in the PIM-SM domain. Static RPs apply to small-scale PIM networks with stable topologies. To enhance the robustness and the operation management of a multicast network, a static RP is usually used as a backup of a dynamic RP.

  • BSR RP

    To use a BSR RP, select several routers in the PIM-SM domain and configure them as Candidate-Rendezvous Points (C-RPs) and Candidate-BootStrap Routers (C-BSRs). Then, an RP is automatically elected in the PIM-SM domain.

A multicast group may be in the service ranges of both the BSR RP and static RP. By default, the router preferentially selects the BSR RP unless the static RP is configured to be preferentially selected.

Configuring an RP to serve only one multicast group is recommended. This can reduce the load of a single RP and enhance network robustness.

Pre-configuration Tasks

Before configuring PIM-SM, configure a unicast routing protocol to ensure that unicast routes are reachable.

Configuration Procedures

Figure 4-4 Flowchart for configuring PIM-SM
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Updated: 2019-01-03

Document ID: EDOC1100055017

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