agentPortSecurityStaticMACs 1.3.6.1.4.1.4526.10.20.1.2.1.6

This variable displays the statically locked MAC addresses for port. The list displayed in a particular fashion : 2 a0:b1:c2:d1:e3:a1,11 a0:b1:c2:d3:e4:f5 (i.e., VLAN MAC pairs separated by commas).