PIM Neighbor Relationships Between CEs, PEs, and Ps

PIM neighbor relationships are set up between two or more directly connected multicast devices on the same network segment. A PIM neighbor relationship in an MD VPN instance can be a PE-CE neighbor relationship, a PE-P neighbor relationship, or a PE-PE neighbor relationship.

As shown in Figure 1, VPN A instances on each PE and the sites that belong to VPN A implement multicast in VPN A. Figure 2 shows neighbor relationships between CEs, PEs, and Ps.

Figure 1 Multicast in VPN A

Figure 2 Neighbor relationships between CEs, PEs, and Ps in an MD

• PE-CE neighbor relationship

  A PE-CE neighbor relationship is set up between a PE interface bound to a VPN instance and a CE interface.

• PE-P neighbor relationship

  A PE-P neighbor relationship is set up between a PE interface bound to the public network instance and a P interface.

• PE-PE neighbor relationship

  A PE-PE neighbor relationship is set up between two PEs after a local PE MTI receives Hello packets from a remote PE MTI.