This is the distinguished name of the record describing the specific peer switch this fabric interconnect's cabling connects to -- e.g. an upstream network switch or the other fabric interconnect. This Dn identifies exactly which discovered peer device the surrounding id, name, transport, and type fields on this row describe, which matters when a fabric interconnect has cabling detail recorded for more than one type of connected neighbor. A Dn like 'sys/switch-A/cabling/sw' identifies the discovered peer-switch record for fabric interconnect A's cabling.