hpicfPimSPTThreshold 1.3.6.1.4.1.11.2.14.11.5.1.20.1.1.3

Specifies a threshold for switching to the Shortest Path Tree (SPT) on this router. If the object has the special value of -1, the Shared Tree rooted to the Rendezvous Point (RP) will be used indefinitely on the router. Default is -1.