The following webpage lists the location of the Extreme Networks MIBs: http://www.extremenetworks.com/support/policies/mibs/
Note: the EOS MIB's are directly listed on the page above in TAR and ZIP format. The EXOS MIBs are on the Extreme Portal.
The MIB's are available in the Extreme Portal on the Products page and also the Downloads page. On the Products page, the MIBs are listed under the Software & Downloads section for each product after you expand the tree for the needed version, as shown in the example below:
You can also directly search for the needed MIB in the Downloads page, as shown in the example below:
EXOS MIBs that you are entitled to should be available for download in the Extreme Portal in the Products page or the Downloads page.
If you have any questions about getting access to the Extreme Portal please reference the eSupport Transition Page.
If you are having problems finding the correct MIBs that you believe you are entitled to please contact GTAC or consider posting about it on the Extreme Networks Community: the Hub.