1. Nokia 7750 SR OS R19.10.R1 Router Configuration Guide, Part: PIM, Section: PIM Command Reference
Reference: In the description for the show router pim bootstrap command, the output fields are explained. The Candidate BSR State field value of Elected BSR indicates that "The local router is the elected BSR." The RPF Neighbor field showing Local confirms the BSMs originate from this router, which is only true for the elected BSR.
2. Nokia 4A0-108 Courseware, Module: IP Multicast Routing
Reference: The course material on PIM-SM bootstrap mechanism details the BSR election process. It explains that only the router that wins the election will assume the Bootstrap Router state and originate Bootstrap Messages. The show router pim bootstrap command on the elected BSR will reflect this status with fields like Candidate BSR State: Elected BSR and RPF Neighbor: Local.