There are a lot of switches and routers out there whose manuals doesn't specify whether or not they're supporting Jumbo Frames.
Searching for it on the web doesn't bring up any good answers so it's natural to ask a question at Super User.
Here are two questions about Jumbo Frames for two different router models from the same company.
Is asking the question Jumbo Frames on D-Link Routers and then have a community answer better than having a separate question for each model? How will search engines treat that and will it be easy to find?