| OID | 1.3.6.1.4.1.266.20.3.1.1.20 | 
| Module | NEXANS-BM-MIB (Nexans) | 
| Nom | portSecurityMacAddr3 | 
| Acces | readwrite | 
| Status | current | 
| Description | The third MAC address used for port security. If portSecurityAdminState has the value disable(2), portSecurityManualSettingMacAddr(3) or vendorSettingMacAddr(12) then this object will be read-write. In any other mode this object will be read-only and shows the third automatically learned MAC addresses for that port. | 
| Syntaxe | MacAddress (SNMPv2-TC) |