Each interface as seen in the naming convention had its own name.

Example: For the Austria 6NET core router

Fast Ethernet:                   fe0 fe0.at6.at.6net.org
Gig Ethernet:                     e0 ge0.at6.at.6net.org
Loopback:                          lo0 lo0.at6.at.6net.org

POS from Austria to Germany: de.at6.at.6net.org