In hpicfGenRptr.MIB I see:
"hpSecureAuthAddrTable OBJECT-TYPE
SYNTAX SEQUENCE OF HpSecureAuthAddrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table containing the authorized addresses for
each port. An authorized address is an address
learned while the hpSecPtLearnMode for the port
is set to learnContinuous, learnFirstN, or
learnFirstNConditionally; or an address in the
hpSecureCfgAddrTable when the hpSecPtLearnMode
for the port is set to configureSpecific.
>>>>>>>>>>On a switch, for ports whose hpSecPtLearnMode
is set to learnContinuous, this table may return
MAC address information based on the switch's
802.1d forwarding database<<<<<<<<<<<"
Which sounds like it might provide what you want.
Ron