Exports physical tunnel topology information for specified appliance nePks as a downloadable CSV file. Physical (underlay) tunnels are point-to-point connections over WAN interfaces that form the foundation for overlay (bonded) tunnels. The CSV includes source/destination appliance details (hostname, site, nePk), HA peer mappings, WAN interface information (name, label, IP, HA status), tunnel identifiers (tunnelId-A, tunnelId-Z), tunnel alias names, administrative state, tunnel mode, and the overlay tunnel IDs that this physical tunnel supports (supportedTunnel). Fields tunnelSubType and tunnelSubTypeId are 'n/a' for underlay tunnels as these apply only to overlay and passthrough types.