Configuring PIM on a VPN allows a VPN multicast routing table to be established to guide multicast traffic forwarding.
On an mLDP in-band MVPN network, PIM is used as the multicast routing protocol on VPNs. A PIM neighbor relationship can be established between devices only after PIM-SM is enabled on interfaces of the devices, enabling a VPN multicast routing table to be established to guide multicast traffic forwarding.
Perform the following steps on PEs' interfaces bound to VPN instances and on the CEs' interfaces connected to the PEs:
In the current version, mLDP signaling can transmit only PIM-SM/PIM-SSM (S, G) Join messages.