The value of vRtrPimNgIfP2mpLdpTreeJoinType specifies the option to to join a P2MP LDP tree towards the multicast source. When the value of this object is set to other than 'none', then a PIM multicast join received on an interface is processed to join P2MP LDP LSP using the in-band signaled P2MP tree for the same multicast flow. LDP P2MP tree is setup towards the multicast source. Route to source of the multicast node is looked up from the RTM. The next-hop address for the route to source is set as the root of LDP P2MP tree. When the value is set to 'ipv4' or 'ipv6', it enables dynamic mLDP in-band signaling for IPv4 or IPv6 PIM joins respectively. When both 'ipv4' and 'ipv6' are set then it enables dynamic mLDP in-band signaling for IPv4 and IPv6 PIM joins. When it is 'none', the P2MP LDP tree is disjoined from the multicast source.