This is the distinguished name of the network endpoint object associated with this internal link, as tracked on the Fabric Interconnect side. It matters on the same internal chassis backplane link, but the record kept on the Fabric Interconnect (switch) side rather than the IOM/server side because it ties this switch-side link record back to the logical network endpoint whose traffic passes over this connection. Following epDn from this link's fabric-interconnect side lets an admin trace a fabric-interconnect-side fault back to the specific chassis endpoint it will actually affect.