snmpFddiMACOldUpstreamNbr 1.3.6.1.2.1.10.15.2.2.1.9

The previous value of the MAC's upstream neighbor's long individual MAC address. It may be determined by the Neighbor Information Frame protocol (refer to ANSI SMT 7.2.1). The value shall be reported as '00 00 00 00 00 00' if it is unknown.