Hi
first of all, going to cisco download page, I don't see same ios release as you.
second thing, I don't have any 3560c-8pc-s right now and can't tell you if this is a supported feature. However i've seen on cisco website that 3560c isn't supporting glbp, same result on cisco ios feature.
take a look on attached files.
I'm sorry but I couldn't answer with more details.
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Thanks
Francesco
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