- The file from Extreme Networks was an aggregate MIB patch file not a standard individual MIB
- UIM 8.5.1 - snmptd 3.30
You cannot load this file. It contains an aggregation of multiple MIBs hence the name is not a standard MIB name. If you look at that file, it has ~86 unique MIBs contained within it - like an aggregate patch file. If you search on BEGIN as a whole word/exact match you can see each MIB in the file.
Each MIB also has its own IMPORTS sections so if you need ALL these MIBs loaded, make you have each separate MIB loaded as well as the dependent MIBs that are listed in the IMPORTS section.
If you search on BEGIN using Notepad ++, you can see the MIBs.