The Extreme Networks MIBs are located at www.extremenetworks.com/support/policies/mibs/.
When you provide your serial number or agreement number, the MIBs are available under each release.
For detailed information on which MIBs and SNMP traps are supported, see the Extreme Networks Proprietary MIBs and MIB Support Details sections in the ExtremeXOS 16.2 User Guide.