Indicate the mask to be logical-ANDed with the learned address before being compared to the value in the rlMacBasePrioSADATCAddress field.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)Dell MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copiesNETGEAR official product and EOL MIB downloads