The Port Number of the Port which offers the lowest path cost from this bridge to the CIST Root Bridge.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copiesNortel MIB copies (LibreNMS/Observium Community)Radware MIB copies (LibreNMS/Observium Community)