The next time if you find that pim neighbourship is not coming up for a customer which is coming through l2tpv3 to MPLS enabled PE, might hit with the bug which is not listed in cisco bug tool kit. During the lab, we find the issue and look for the cisco site for bug but do not find any information. IOS used for l2tpv3 is entservices9 12.3(14)T5.