The SNMP MIBs for the SEL-2744 are listed below. The SEL-2744 can operate as an RSTP-based or SDN-based managed switch. The MIBs for both technologies are available for download here.
This zip file contains the MIBs for the SEL-2743 when operating SDN-based firmware.
This zip file contains the MIBs for the SEL-2743 when operating RSTP-based firmware.