Identifies, by standard ifIndex number, the local physical port on this Extreme switch where an EDP (Extreme Discovery Protocol) neighbor entry was discovered. Since EDP is Extreme's Cisco-CDP-like neighbor discovery protocol, this index lets an admin map a discovered neighbor device back to the exact local port it is plugged into. For example, an extremeEdpPortIfIndex value of 1005 would tie a neighbor's identity, software version, and slot/port info to the switch's port with ifIndex 1005.